Paroxetine
Selective Serotonin Reuptake Inhibitor (SSRI) for depression, anxiety disorders, OCD, PTSD and panic disorder
📊 Quick Facts About Paroxetine
💡 Key Takeaways About Paroxetine
- Broad indication range: Paroxetine is approved for depression, OCD, panic disorder, social anxiety, PTSD, and generalized anxiety disorder in adults
- Takes time to work: Full therapeutic effects typically develop after 4–6 weeks of consistent use; some improvement may be noticed after 2 weeks
- Never stop abruptly: Paroxetine has a relatively high rate of withdrawal symptoms – always taper gradually under medical supervision
- Not for under 18s: Paroxetine should not be used in children and adolescents under 18 years due to increased risk of suicidal behavior and hostility
- Pregnancy caution: Use during early pregnancy is associated with an increased risk of congenital heart defects – discuss alternatives with your doctor
What Is Paroxetine and What Is It Used For?
Paroxetine is a selective serotonin reuptake inhibitor (SSRI) antidepressant used to treat depression and various anxiety disorders in adults. It works by increasing the availability of the neurotransmitter serotonin in the brain, helping to restore chemical balance and improve mood, reduce anxiety, and enhance emotional well-being. Paroxetine is approved for six distinct indications, making it one of the most broadly indicated SSRIs available.
Paroxetine belongs to a group of medications known as SSRIs (selective serotonin reuptake inhibitors). These medications work by selectively blocking the reabsorption (reuptake) of the neurotransmitter serotonin in the brain. By preventing serotonin from being reabsorbed back into nerve cells, paroxetine increases the amount of serotonin available in the synaptic cleft – the space between nerve cells where chemical signals are transmitted. This enhanced serotonergic activity is believed to help regulate mood, reduce anxiety, and alleviate the symptoms of various psychiatric disorders.
Among the SSRIs, paroxetine is notable for having the highest binding affinity for the serotonin transporter, meaning it is the most potent inhibitor of serotonin reuptake in its class. It also has a mild anticholinergic effect, which is unusual among SSRIs and may contribute to some of its unique side effects such as dry mouth, constipation, and sedation. The exact mechanism by which SSRIs achieve their therapeutic effects in depression and anxiety is not fully understood, but the increase in serotonin availability is believed to be central to their action.
Paroxetine is marketed globally under various brand names, including Paxil (United States), Seroxat (United Kingdom and Europe), and Aropax (Australia), as well as numerous generic formulations such as Paroxetin HEXAL, Paroxetin Orion, and Paroxetin Teva. It is available as film-coated tablets in strengths of 10 mg and 20 mg.
Approved Indications
Paroxetine is approved by regulatory authorities including the EMA and FDA for the treatment of the following conditions in adults:
- Major depressive disorder (MDD): A clinical condition characterized by persistent low mood, loss of interest, sleep disturbances, fatigue, difficulty concentrating, and feelings of worthlessness or hopelessness
- Obsessive-compulsive disorder (OCD): A condition characterized by recurring, unwanted thoughts (obsessions) and repetitive behaviors (compulsions) that the individual feels driven to perform
- Panic disorder: Recurrent unexpected episodes of intense fear accompanied by physical symptoms such as palpitations, sweating, trembling, and shortness of breath, including panic disorder with agoraphobia (fear of open spaces or situations)
- Social anxiety disorder (social phobia): Intense anxiety and avoidance of social situations due to fear of embarrassment, negative judgment, or scrutiny by others
- Post-traumatic stress disorder (PTSD): A condition that develops after exposure to a traumatic event, characterized by flashbacks, nightmares, hypervigilance, and emotional numbing
- Generalized anxiety disorder (GAD): Persistent, excessive worry about a range of everyday situations, accompanied by physical symptoms such as muscle tension, restlessness, fatigue, and difficulty concentrating
Depression affects an estimated 280 million people worldwide according to the World Health Organization. Anxiety disorders are among the most common mental health conditions globally, with an estimated prevalence of 4% of the global population. Effective pharmacological treatment, combined with psychotherapy where appropriate, is essential for managing these conditions and improving quality of life.
Your doctor has assessed that paroxetine is appropriate for your specific condition. Paroxetine may also be used for conditions not listed here. Always follow your doctor's instructions and consult them if you have questions about why you have been prescribed this medication.
What Should You Know Before Taking Paroxetine?
Before taking paroxetine, you must inform your doctor about all medical conditions, other medications, and whether you are pregnant or breastfeeding. Paroxetine must never be combined with MAO inhibitors, thioridazine, or pimozide. Special caution is needed for patients with epilepsy, heart conditions (including QT prolongation), liver or kidney disease, diabetes, bleeding disorders, and glaucoma. Paroxetine is not recommended for patients under 18 years of age.
Contraindications
You must not take paroxetine in the following situations:
- If you are taking MAO inhibitors (monoamine oxidase inhibitors) such as moclobemide or methylene blue (methylthioninium chloride), or have taken them within the last two weeks. Your doctor will advise you on how to begin paroxetine after stopping an MAO inhibitor
- If you are taking thioridazine or pimozide (antipsychotic medications known to affect the heart’s electrical activity)
- If you are allergic to paroxetine, soy, peanuts, or any other ingredients in the tablets
Combining paroxetine with MAO inhibitors can cause serotonin syndrome, a potentially life-threatening condition. Symptoms include extreme agitation, confusion, rapid heartbeat, high blood pressure, high temperature, sweating, trembling, hallucinations, muscle rigidity, and loss of consciousness. If you experience these symptoms, seek emergency medical attention immediately.
Warnings and Precautions
Talk to your doctor before taking paroxetine if you have or have previously had any of the following conditions:
- Heart rhythm abnormalities: Including a condition seen on ECG called prolonged QT interval, a family history of QT prolongation, heart failure, slow heart rate, or low potassium or magnesium levels
- Epilepsy or seizures: Contact your doctor immediately if you experience a seizure while taking paroxetine
- Bipolar disorder or manic episodes: Paroxetine may trigger mania in susceptible individuals; if you experience overactive behavior or thoughts, contact your doctor immediately
- Liver, kidney, or heart problems: Your doctor may need to adjust your dose
- Diabetes: Blood sugar levels may be affected, and diabetes medication may need adjustment
- Bleeding disorders: Paroxetine may increase the risk of bleeding, particularly when taken with blood thinners (warfarin), antipsychotics (perphenazine, clozapine), tricyclic antidepressants, or NSAIDs (aspirin, ibuprofen, diclofenac)
- Glaucoma (raised eye pressure): Paroxetine may cause acute angle-closure glaucoma in susceptible individuals
- Low-salt diet: Inform your doctor if you are on a salt-restricted diet
- Electroconvulsive therapy (ECT): Inform your doctor if you are receiving ECT
- Tamoxifen for breast cancer: Paroxetine may reduce the effectiveness of tamoxifen; your doctor may recommend a different antidepressant
Suicidal Thoughts and Worsening of Depression or Anxiety
If you are depressed or suffer from anxiety, you may sometimes have thoughts of self-harm or suicide. These thoughts may increase when first starting antidepressant treatment, as it takes time for these medications to take effect, usually about 2 weeks and sometimes longer.
These thoughts are more likely if you:
- Have previously had thoughts of self-harm or suicide
- Are a young adult under 25 years of age. Clinical studies have shown that young adults with psychiatric conditions treated with antidepressants have an increased risk of suicidal thoughts and self-harm behavior
If you have thoughts of self-harm or suicide at any time, contact your doctor immediately or go to the nearest emergency department. It may be helpful to tell a relative or close friend that you are depressed or anxious, and to ask them to read this information. Ask them to tell you if they think your condition is getting worse or if they are worried about changes in your behavior.
Restlessness (Akathisia)
Some patients who take paroxetine develop a condition called akathisia, which involves feelings of restlessness and an inability to sit or stand still. This typically occurs during the early weeks of treatment. Increasing the dose may actually worsen these symptoms, so it is important to speak with your doctor if you experience restlessness rather than assuming the medication is not working.
Serotonin Syndrome and Neuroleptic Malignant Syndrome
In rare cases, patients taking paroxetine may develop serotonin syndrome or symptoms resembling neuroleptic malignant syndrome, particularly when combined with other serotonergic medications. Symptoms may include feeling extremely agitated or irritable, confusion, restlessness, feeling hot, sweating, trembling, shivering, hallucinations, muscle stiffness, sudden muscle twitching, or rapid heartbeat. The severity can escalate to loss of consciousness. If you experience any of these symptoms, seek immediate medical attention.
Sexual Dysfunction
Medications such as paroxetine (SSRIs) can cause symptoms of sexual dysfunction, including decreased libido, delayed or absent orgasm, erectile difficulties, and ejaculatory disorders. In some cases, these symptoms have persisted even after treatment was discontinued. If you experience sexual side effects, discuss them with your doctor, who may consider dose adjustment or switching to another antidepressant.
Children and Adolescents Under 18 Years
Paroxetine should not be used in children and adolescents under 18 years of age. Clinical studies in this age group have shown an increased risk of side effects including suicidal behavior, self-harm, hostility (aggression, defiance, anger), appetite loss, tremor, abnormal sweating, hyperactivity, agitation, emotional changes (including crying and mood swings), and unusual bruising or bleeding (such as nosebleeds). The long-term effects on growth, maturation, and cognitive and behavioral development have not been fully established in patients under 18.
When treatment was stopped in studies involving patients under 18, withdrawal symptoms were common, including abdominal pain, nervousness, and emotional changes including crying, mood swings, self-harm thoughts, and suicide attempts.
Pregnancy and Breastfeeding
If you are pregnant, breastfeeding, think you may be pregnant, or are planning to have a baby, consult your doctor before taking paroxetine.
Pregnancy: There are reports of an increased risk of birth defects, especially congenital heart defects, in babies whose mothers took paroxetine during the first few months of pregnancy. In the general population, approximately 1 in 100 babies is born with a heart defect. This risk increases to approximately 2 in 100 babies when the mother has taken paroxetine. You and your doctor should discuss whether it is better to switch to another treatment or to gradually taper off paroxetine during pregnancy.
If paroxetine is used during late pregnancy, particularly in the third trimester, it may increase the risk of:
- Persistent pulmonary hypertension of the newborn (PPHN): A condition where the blood pressure in the blood vessels between the baby’s heart and lungs is too high
- Neonatal withdrawal symptoms: Including breathing difficulties, bluish skin, irritability, excessive crying, feeding problems, trembling, muscle stiffness or floppiness, seizures, and exaggerated reflexes. These symptoms usually appear within the first 24 hours after birth
- Increased risk of heavy vaginal bleeding shortly after delivery, especially in women with a history of bleeding disorders
Breastfeeding: Paroxetine is excreted in breast milk in very small amounts. Consult your doctor before breastfeeding while taking this medication.
Fertility: Animal studies have shown that paroxetine may reduce sperm quality. While this could theoretically affect fertility, no such effect has been demonstrated in humans.
Driving and Operating Machinery
Possible side effects of paroxetine include dizziness, confusion, drowsiness, and blurred vision. If you experience these side effects, do not drive or operate machinery. You are personally responsible for assessing whether you are fit to drive or perform tasks requiring alertness.
Important Ingredient Information
Paroxetine tablets contain less than 1 mmol (23 mg) sodium per tablet, making them essentially sodium-free. The 20 mg tablets contain soy lecithin – do not use these tablets if you are allergic to peanuts or soy.
How Does Paroxetine Interact with Other Drugs?
Paroxetine has significant interactions with many medications. It must never be combined with MAO inhibitors, thioridazine, or pimozide due to the risk of life-threatening reactions. Paroxetine is a potent inhibitor of the CYP2D6 enzyme, which means it can increase the blood levels of numerous other medications. It also reduces the effectiveness of tamoxifen and should not be used together. Always inform your doctor of all medications and supplements you are taking.
Tell your doctor or pharmacist if you are taking, have recently taken, or might take any other medications. Some medications can affect how paroxetine works, and paroxetine can affect how other medications work. Paroxetine is a potent inhibitor of the cytochrome P450 2D6 (CYP2D6) enzyme, which is responsible for metabolizing many medications. This means paroxetine can increase the blood levels and effects of numerous drugs that are metabolized by this enzyme.
Major Interactions (Do Not Combine)
| Medication | Type | Risk |
|---|---|---|
| MAO inhibitors (moclobemide, methylene blue) | Antidepressants / Diagnostic agents | Serotonin syndrome – potentially life-threatening. Mandatory 2-week washout period required. |
| Thioridazine | Antipsychotic | Increased thioridazine levels via CYP2D6 inhibition, risk of serious cardiac arrhythmias (QT prolongation) and sudden death. |
| Pimozide | Antipsychotic | Increased pimozide levels, risk of serious cardiac arrhythmias (QT prolongation). |
Moderate Interactions (Use with Caution)
| Medication | Type | Effect |
|---|---|---|
| Tamoxifen | Breast cancer treatment | Paroxetine inhibits CYP2D6, reducing conversion of tamoxifen to its active metabolite endoxifen. May significantly reduce tamoxifen efficacy. Use an alternative antidepressant. |
| Warfarin and other anticoagulants | Blood thinners | Increased bleeding risk. INR monitoring required. |
| Lithium, Risperidone, Clozapine | Mood stabilizer / Antipsychotics | Increased risk of serotonin syndrome. Monitor levels and symptoms. |
| Tramadol, Buprenorphine, Pethidine, Fentanyl | Opioid analgesics | Risk of serotonin syndrome and seizures. Tramadol efficacy may be reduced via CYP2D6 inhibition. |
| Sumatriptan and other triptans | Migraine medication | Increased risk of serotonin syndrome. |
| St. John’s Wort (Hypericum perforatum) | Herbal supplement | Increased serotonergic activity and risk of side effects. |
| NSAIDs (aspirin, ibuprofen, diclofenac, celecoxib, meloxicam) | Pain / Anti-inflammatory | Increased risk of gastrointestinal and other bleeding. |
| Tricyclic antidepressants (clomipramine, nortriptyline, desipramine) | Antidepressants | Paroxetine increases tricyclic levels via CYP2D6 inhibition. Increased risk of serotonin syndrome. |
| Metoprolol | Beta-blocker | Paroxetine increases metoprolol levels via CYP2D6 inhibition, potentially causing excessive blood pressure lowering and slow heart rate. |
| Atomoxetine | ADHD medication | Increased atomoxetine levels via CYP2D6 inhibition. |
| Phenytoin, Carbamazepine, Phenobarbital | Antiepileptics | May reduce paroxetine levels (enzyme inducers). Phenytoin levels may increase. |
| Fosamprenavir/Ritonavir | HIV medication | Altered paroxetine levels. Dose adjustment may be needed. |
| Propafenone, Flecainide | Antiarrhythmics | Increased levels via CYP2D6 inhibition, risk of cardiac side effects. |
| Procyclidine | Antiparkinsonian | Paroxetine increases procyclidine levels. |
| Linezolid | Antibiotic (weak MAO inhibitor) | Risk of serotonin syndrome. |
Food and Alcohol Interactions
Paroxetine should be taken in the morning with food, as this may reduce the risk of nausea. The following should be noted regarding food and drink:
- Alcohol: Should be strictly avoided during treatment with paroxetine. Alcohol affects the central nervous system and can worsen side effects such as drowsiness and dizziness. It may also worsen symptoms of depression and anxiety, counteracting the therapeutic effects of the medication
- Tryptophan supplements: A dietary supplement that increases serotonin levels – should not be taken together with paroxetine due to the risk of serotonin syndrome
What Is the Correct Dosage of Paroxetine?
The recommended starting dose of paroxetine for most conditions is 20 mg once daily, taken in the morning with food. For panic disorder, treatment starts at 10 mg daily. Doses may be increased gradually in 10 mg increments based on response, up to a maximum of 50–60 mg daily depending on the condition. The 20 mg tablet can be split in half for 10 mg doses. Always take paroxetine exactly as prescribed by your doctor.
Adults
| Condition | Starting Dose | Recommended Dose | Maximum Dose |
|---|---|---|---|
| Depression | 20 mg/day | 20 mg/day | 50 mg/day |
| OCD | 20 mg/day | 40 mg/day | 60 mg/day |
| Panic Disorder | 10 mg/day | 40 mg/day | 60 mg/day |
| Social Anxiety Disorder | 20 mg/day | 20 mg/day | 50 mg/day |
| PTSD | 20 mg/day | 20 mg/day | 50 mg/day |
| Generalized Anxiety Disorder | 20 mg/day | 20 mg/day | 50 mg/day |
Your doctor will advise on which dose to start with. Most patients begin to feel better after a few weeks of treatment. If you have not noticed any improvement after this time, consult your doctor. Your doctor may decide to gradually increase the dose by 10 mg at a time, up to the maximum daily dose for your condition.
How to Take Paroxetine
Take paroxetine exactly as your doctor has instructed. The tablets should be taken in the morning with food to reduce the risk of nausea. Swallow the tablets whole with a glass of water – do not chew them. The 10 mg tablet has a score line that is not intended for splitting. The 20 mg tablet can be divided into two equal 10 mg doses.
Your doctor will discuss with you how long you need to continue taking paroxetine. Treatment may last for many months or longer, depending on your condition and response. It is important to continue taking the medication even after you feel better, to prevent relapse.
Children and Adolescents
Paroxetine is not recommended for use in children and adolescents under 18 years of age. Studies have not demonstrated efficacy in this age group, and there is an increased risk of suicidal behavior, hostility, and aggression. If your doctor has prescribed paroxetine for a young person and you wish to discuss this, consult your doctor again.
Elderly Patients
The maximum dose for patients over 65 years of age is 40 mg per day. Elderly patients may be more susceptible to certain side effects, particularly low blood sodium levels (hyponatremia).
Patients with Liver or Kidney Disease
If you have liver problems or severe kidney disease, your doctor may prescribe a lower dose than normally recommended. Regular monitoring may be necessary.
Missed Dose
Take your medication at the same time each day. If you forget to take a dose and remember before bedtime, take it straight away. Continue as normal the next day. If you do not remember until the night or the following day, skip the missed dose. You may experience some withdrawal symptoms, but these should resolve after taking your next dose at the usual time. Do not take a double dose to make up for a missed dose.
Overdose
Never take more tablets than prescribed by your doctor. If you or someone else takes too much paroxetine, contact your doctor, go to the nearest emergency department, or call your local poison control center immediately. Always bring the medication packaging with you. Symptoms of overdose may include those listed under side effects, as well as fever, uncontrollable muscle contractions, and in severe cases, loss of consciousness.
Paroxetine will not relieve your symptoms immediately. All antidepressants require time to work. Some patients improve after a couple of weeks, while for others it may take longer. Some people taking antidepressants experience a worsening of symptoms before they begin to feel better. If you have not started to improve after several weeks, contact your doctor. Your doctor should schedule a follow-up visit a few weeks after you begin treatment.
What Are the Side Effects of Paroxetine?
Like all medicines, paroxetine can cause side effects, although not everyone experiences them. The most common side effects are nausea and changes in sexual function. Side effects are most likely to occur during the first weeks of treatment and tend to improve with continued use. Serious side effects requiring immediate medical attention include allergic reactions, serotonin syndrome, seizures, unusual bleeding, and acute glaucoma.
Severe allergic reaction (swelling of face, lips, tongue, or throat; difficulty breathing; skin rash with blisters); symptoms of serotonin syndrome (confusion, agitation, rapid heartbeat, high temperature, muscle stiffness, twitching); seizures; unusual bruising or bleeding; bloody vomit or blood in stool; sudden eye pain with blurred vision (acute glaucoma); or thoughts of self-harm or suicide.
Very Common
Affects more than 1 in 10 people
- Nausea (taking with food in the morning reduces this risk)
- Changes in sexual drive or function, including absent orgasm
- Erectile dysfunction and ejaculatory disorders in men
Common
Affects 1 in 10 to 1 in 100 people
- Elevated cholesterol levels
- Decreased appetite
- Insomnia or drowsiness
- Abnormal dreams (including nightmares)
- Dizziness, tremor, headache
- Difficulty concentrating
- Agitation, feeling abnormally weak
- Blurred vision, yawning, dry mouth
- Diarrhea or constipation, vomiting
- Sweating, weight gain
Uncommon
Affects 1 in 100 to 1 in 1,000 people
- Brief rise or fall in blood pressure (may cause dizziness on standing)
- Faster than normal heart rate
- Movement impairment, stiffness, abnormal mouth/tongue movements
- Dilated pupils, skin rash, itching
- Confusion, hallucinations
- Decreased white blood cell count
- Urinary retention or urinary incontinence
- Loss of blood sugar control in diabetic patients
Rare and Very Rare
Affects fewer than 1 in 1,000 people
- Abnormal breast milk production in men and women
- Slow heart rate, liver enzyme changes
- Panic attacks, mania (overactive behavior or thoughts)
- Depersonalization, restless legs syndrome
- Joint and muscle pain, menstrual disturbances
- Increased prolactin levels
- Severe skin reactions (erythema multiforme, Stevens-Johnson syndrome, toxic epidermal necrolysis)
- Liver problems causing jaundice (yellowing of skin/eyes)
- SIADH (syndrome of inappropriate antidiuretic hormone secretion)
- Fluid retention (swelling of arms/legs)
- Sensitivity to sunlight
- Painful, prolonged erection (priapism)
- Decreased platelet count
- Acute glaucoma (sudden eye pain and blurred vision)
Frequency Not Known
The following side effects have been reported but their exact frequency is unknown:
- Suicidal thoughts or behavior
- Aggression
- Heavy vaginal bleeding shortly after delivery (postpartum hemorrhage)
- Inflammation of the colon (causing diarrhea)
- Teeth grinding (bruxism)
- Tinnitus (ringing, buzzing, or whistling sounds in the ears)
Withdrawal Symptoms
Paroxetine is known to have a relatively high incidence of withdrawal symptoms compared to other SSRIs, partly due to its shorter half-life and potent serotonin reuptake inhibition. According to clinical studies, approximately 3 in 10 patients experience one or more withdrawal symptoms when stopping paroxetine treatment.
Common withdrawal symptoms (up to 1 in 10 people):
- Dizziness (feeling unsteady, balance difficulties)
- Sensory disturbances such as tingling, burning, and less commonly, electric shock sensations (including in the head) and tinnitus
- Sleep disturbances (vivid dreams, nightmares, insomnia)
- Anxiety, headache
Less common withdrawal symptoms (up to 1 in 100 people):
- Nausea, sweating (including night sweats)
- Restlessness or agitation, tremor
- Confusion or disorientation, diarrhea
- Emotional instability or irritability
- Visual disturbances, palpitations
An increased risk of bone fractures has been observed in patients taking SSRIs, including paroxetine. If you have risk factors for osteoporosis, discuss this with your doctor.
How Should You Store Paroxetine?
Store paroxetine at room temperature in the original packaging, out of the reach and sight of children. Do not use the medication after the expiry date printed on the packaging. If using half tablets (20 mg split), store the remaining half safely in the packaging. Do not dispose of medications via wastewater or household waste.
Keep paroxetine out of the reach and sight of children. Do not use the medication after the expiry date stated on the blister, container, or carton after “EXP.” The expiry date refers to the last day of that month. No special storage conditions are required for paroxetine film-coated tablets.
If you are using the 20 mg tablets and splitting them for a 10 mg dose, store the remaining half tablet safely in the original packaging.
Do not throw away medications in wastewater or household waste. Ask your pharmacist how to dispose of medications that are no longer needed. These measures help protect the environment.
What Does Paroxetine Contain?
Each paroxetine tablet contains paroxetine hydrochloride as the active ingredient, equivalent to 10 mg or 20 mg of paroxetine. The tablets also contain inactive ingredients (excipients) including mannitol, microcrystalline cellulose, sodium starch glycolate, and magnesium stearate. The 20 mg tablets contain soy lecithin in the film coating.
Active Ingredient
The active substance is paroxetine hydrochloride. Each film-coated tablet contains paroxetine hydrochloride equivalent to:
- 10 mg paroxetine
- 20 mg paroxetine
Inactive Ingredients (Excipients)
Tablet core: Mannitol, microcrystalline cellulose, sodium starch glycolate (Type A), and magnesium stearate.
Film coating (10 mg): Basic butylated methacrylate copolymer, poly(vinyl alcohol) partially hydrolyzed (E1203), macrogol (E1521), titanium dioxide (E171), talc (E553b), and iron oxide yellow (E172).
Film coating (20 mg): Basic butylated methacrylate copolymer, poly(vinyl alcohol) partially hydrolyzed (E1203), titanium dioxide (E171), talc (E553b), soy lecithin (E322), and xanthan gum (E415).
Tablet Appearance
10 mg tablets: Yellow, round, film-coated, biconvex tablets, 8 mm in diameter, with a score line on one side and marked “P10” on the other side. The score line is not intended for splitting.
20 mg tablets: White, round, film-coated, biconvex tablets, 10 mm in diameter, with a score line on one side and marked “P20” on the other side. The tablet can be divided into two equal 10 mg doses.
How Should You Stop Taking Paroxetine?
Never stop taking paroxetine without consulting your doctor. When it is time to stop, your doctor will help you gradually reduce your dose over several weeks or months to minimize withdrawal symptoms. A typical approach is reducing the dose by 10 mg per week. Even with gradual tapering, some withdrawal symptoms may occur but usually resolve within 2 weeks.
Do not stop taking paroxetine until your doctor tells you to. When treatment is to be discontinued, your doctor will help you slowly reduce your dose over a period of weeks or months. One way to do this is to gradually reduce the dose by 10 mg per week. Most patients find that withdrawal symptoms are mild and resolve on their own within 2 weeks. For some patients, symptoms may be more severe or last longer.
If you experience withdrawal symptoms when you stop taking paroxetine, your doctor may recommend that you taper more slowly. Contact your doctor if you experience severe withdrawal symptoms. In some cases, your doctor may suggest restarting the medication at a previous dose and then tapering more gradually.
Even if you experience withdrawal symptoms, it will be possible for you to stop taking paroxetine. The key is to do so gradually, under medical supervision, and at a pace that is comfortable for you.
Paroxetine has a relatively short elimination half-life (approximately 21 hours) compared to some other SSRIs such as fluoxetine (which has a half-life of 4–6 days). This means that paroxetine levels in the blood drop more quickly after stopping, which is why withdrawal symptoms tend to be more pronounced with paroxetine than with longer-acting SSRIs. Gradual dose reduction allows the brain to slowly adapt to decreasing serotonin levels.
Frequently Asked Questions About Paroxetine
Paroxetine typically begins to show some effects within 1–2 weeks, but it usually takes 4–6 weeks of consistent daily use to experience the full therapeutic benefit. For some conditions like OCD, it may take 8–12 weeks. It is important to continue taking paroxetine as prescribed even if you do not notice immediate improvement. Some patients feel worse before they feel better. Your doctor will schedule a follow-up visit a few weeks after starting treatment to monitor your progress.
No, alcohol should be avoided while taking paroxetine. Both substances affect the central nervous system, and combining them can intensify side effects such as drowsiness, dizziness, and impaired coordination. Alcohol can also worsen symptoms of depression and anxiety, counteracting the therapeutic effects of paroxetine. If you have questions about alcohol consumption during treatment, speak with your doctor.
Paroxetine is not recommended for patients under 18 years because clinical studies in children and adolescents showed an increased risk of suicidal behavior, self-harm, hostility (aggression, defiance, anger), and other adverse effects. The studies did not demonstrate sufficient efficacy in this age group to justify the risks. The long-term effects on growth, brain development, and behavior have not been fully established. Other SSRIs, such as fluoxetine, have stronger evidence for use in children with depression.
Paroxetine use during pregnancy carries specific and well-documented risks. First-trimester exposure is associated with an increased risk of congenital heart defects (approximately 2 in 100 vs. 1 in 100 in the general population). Third-trimester use may increase the risk of persistent pulmonary hypertension of the newborn (PPHN) and neonatal withdrawal symptoms. Women who are pregnant, planning to become pregnant, or breastfeeding should discuss the risks and benefits with their healthcare provider. In many cases, the doctor may recommend switching to a different antidepressant with a more established safety profile during pregnancy.
Paroxetine has a shorter half-life (approximately 21 hours) compared to SSRIs like fluoxetine (4–6 days). This means paroxetine is eliminated from the body more quickly, leading to a more abrupt drop in serotonin availability when the medication is stopped or missed. Additionally, paroxetine’s potent serotonin reuptake inhibition means the brain becomes more dependent on the drug to maintain serotonin levels. Studies show that approximately 30% of patients experience withdrawal symptoms when stopping paroxetine, compared to lower rates with longer-acting SSRIs. This is why gradual dose reduction over several weeks is essential.
Paroxetine is one of several SSRIs, which also include sertraline, fluoxetine, citalopram, and escitalopram. All SSRIs block serotonin reuptake, but they differ in their pharmacokinetic profiles, half-lives, side effects, and drug interaction potential. Paroxetine has the highest serotonin transporter binding affinity among SSRIs and also has mild anticholinergic effects (which may cause dry mouth and constipation). It is a potent CYP2D6 inhibitor, meaning it has a higher potential for drug interactions than some other SSRIs. Paroxetine is particularly well-studied for generalized anxiety disorder, panic disorder, and social anxiety. The choice of SSRI depends on individual patient factors, including medical history, other medications, and tolerability.
References and Sources
This article is based on the following peer-reviewed sources and international guidelines. All medical claims are supported by evidence level 1A (systematic reviews and randomized controlled trials).
- European Medicines Agency (EMA). Paroxetine – Summary of Product Characteristics (SmPC). EMA; 2024. Full prescribing information for the European Union.
- U.S. Food and Drug Administration (FDA). Paxil (paroxetine hydrochloride) – Prescribing Information. FDA; 2024. Complete United States prescribing information.
- National Institute for Health and Care Excellence (NICE). Depression in adults: treatment and management. NICE guideline [NG222]. NICE; 2022. Updated 2024.
- National Institute for Health and Care Excellence (NICE). Generalised anxiety disorder and panic disorder in adults: management. NICE guideline [CG113]. NICE; 2020.
- Cipriani A, Furukawa TA, Salanti G, et al. Comparative efficacy and acceptability of 21 antidepressant drugs for the acute treatment of adults with major depressive disorder: a systematic review and network meta-analysis. Lancet. 2018;391(10128):1357-1366.
- British National Formulary (BNF). Paroxetine. NICE BNF; 2025. Drug monograph with dosing, interactions, and side effects.
- Fava GA, Benasi G, Lucente M, et al. Withdrawal symptoms after serotonin-noradrenaline reuptake inhibitor discontinuation: systematic review. Psychother Psychosom. 2018;87(4):195-203.
- Bar-Oz B, Einarson T, Einarson A, et al. Paroxetine and congenital malformations: meta-analysis and consideration of potential confounding factors. Clin Ther. 2007;29(5):918-926.
About the Medical Editorial Team
This article was written and reviewed by the iMedic Medical Editorial Team, consisting of licensed specialist physicians with expertise in clinical pharmacology, psychiatry, and evidence-based medicine.
All content is reviewed by board-certified physicians following international guidelines (WHO, EMA, FDA, BNF, NICE) and the GRADE evidence framework.
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Last medical review: | Published: | Evidence level: 1A (Systematic reviews and RCTs) | Next scheduled review: