Medications During Pregnancy & Breastfeeding

What Medications Are Safe During Pregnancy?

Paracetamol (acetaminophen) is the recommended first-line pain reliever during pregnancy. Certain antibiotics like penicillin, some antihistamines, and common prenatal vitamins are also considered safe. However, no medication is entirely without risk, and all use should be discussed with a healthcare provider.

The question of which medications are safe during pregnancy is one that concerns nearly every expectant mother. Research shows that approximately 70% of pregnant women take at least one prescription medication during their pregnancy, and many more use over-the-counter products. Understanding which drugs are considered safe is essential for making informed decisions about your health and your baby's wellbeing.

The concept of "safe" in pregnancy pharmacology is nuanced. Very few medications have been proven absolutely safe through randomized controlled trials in pregnant women, because such studies would be unethical. Instead, safety data comes from observational studies, pregnancy registries, and decades of clinical experience. When we describe a medication as "safe," we mean that available evidence shows no significant increase in the risk of birth defects, pregnancy complications, or adverse effects on the developing baby when used at recommended doses.

The placenta acts as a partial barrier between the mother's blood and the baby's blood, but most medications can cross it to some degree. The extent to which a drug crosses the placenta depends on its molecular size, fat solubility, protein binding, and other pharmacological properties. Smaller, fat-soluble molecules tend to cross more easily, which is why understanding each drug's specific profile is important.

Your healthcare provider weighs multiple factors when recommending a medication during pregnancy: the severity of your condition, the specific drug's safety profile, the gestational age, available alternatives, and the risks of leaving your condition untreated. This individualized risk-benefit analysis is the cornerstone of prescribing during pregnancy.

Pain Relief in Pregnancy

Paracetamol (acetaminophen) remains the recommended first-line analgesic during pregnancy when used at standard doses (up to 1,000 mg per dose, maximum 3,000 mg per day) for short periods. It has been used for decades by millions of pregnant women, and large-scale studies have not demonstrated a significant increase in major birth defects. However, some recent research has raised questions about potential effects of prolonged high-dose use on neurodevelopment, so the general guidance is to use it only when needed and for the shortest duration possible.

NSAIDs (non-steroidal anti-inflammatory drugs) such as ibuprofen, naproxen, and diclofenac should generally be avoided during pregnancy. Before week 20, there is some evidence linking NSAIDs to an increased risk of miscarriage. After week 20, NSAIDs can reduce amniotic fluid levels and affect fetal kidney development. In the third trimester, they may cause premature closure of the ductus arteriosus, a vital fetal blood vessel that normally closes after birth. The FDA issued a warning in 2020 advising against NSAID use after 20 weeks of pregnancy.

Safe Antibiotics

Several types of antibiotics are considered safe during pregnancy and have extensive safety data. Penicillin-type antibiotics (amoxicillin, ampicillin, penicillin V) are among the most commonly prescribed and best-studied antibiotics in pregnancy. Cephalosporins (cephalexin, ceftriaxone) are also generally regarded as safe. Erythromycin (excluding the estolate form, which can cause liver problems) has a good safety profile as well.

Antibiotics to avoid during pregnancy include tetracyclines (can affect fetal bone and tooth development), fluoroquinolones (potential risk to developing cartilage), and sulfonamides (risk of neonatal jaundice if used near delivery). Metronidazole is generally considered safe after the first trimester, though some providers prefer to avoid it during the first 12 weeks.

Prenatal Vitamins and Supplements

Folic acid (400 micrograms daily) is the most important supplement during pregnancy and should ideally be started at least one month before conception and continued through the first 12 weeks. Folic acid significantly reduces the risk of neural tube defects such as spina bifida. Women with certain risk factors, such as a previous pregnancy affected by neural tube defects, may need a higher dose (4-5 mg daily).

Iron supplements are commonly recommended, particularly in the second and third trimesters, as iron requirements increase substantially during pregnancy. Vitamin D supplementation (10 micrograms/400 IU daily) is recommended throughout pregnancy and breastfeeding. Calcium supplementation may be advised for women with low dietary calcium intake, particularly to reduce the risk of pre-eclampsia.

How Are Medications Classified for Pregnancy Safety?

Medications were historically classified using FDA categories A through X, ranging from safest to most dangerous. This system has been replaced by narrative labeling that provides more detailed information about risks. Your healthcare provider can interpret these classifications and recommend the safest option for your situation.

For decades, the most widely used classification system for medication safety in pregnancy was the FDA's letter category system, introduced in 1979. Although the United States FDA began phasing out this system in 2015 in favor of more descriptive narrative labeling, the letter categories remain widely referenced by healthcare providers worldwide and are still used in many countries' drug databases. Understanding this system helps you interpret information you may find about specific medications.

The old system was imperfect because it oversimplified complex risk information into a single letter. A drug classified as "Category C" might have been placed there because no human studies existed, not because studies showed harm. Conversely, a "Category B" drug was not necessarily safer than a "Category C" drug in all circumstances. The new narrative approach provides information under three subsections: Pregnancy, Lactation, and Females and Males of Reproductive Potential, offering more nuanced and clinically useful guidance.

Different countries and regulatory agencies may classify the same drug differently. The Australian Therapeutic Goods Administration (TGA) uses categories A, B1, B2, B3, C, D, and X. The European Medicines Agency (EMA) requires pregnancy and breastfeeding information in the Summary of Product Characteristics but does not use a formal letter category system. This means that the safety information you find may vary depending on the source country.

It is essential to understand that these categories are historical guides, not absolute rules. A medication's actual risk depends on the dose, duration of use, timing during pregnancy, and the individual patient's circumstances. Always discuss medication safety with your healthcare provider rather than relying solely on category labels.

When Is Medication Most Risky During Pregnancy?

The most critical period for medication-related birth defects is weeks 3 through 12 of pregnancy (the first trimester), when major organs are forming. However, some medications pose specific risks in the second or third trimester, such as NSAIDs affecting kidney development or certain drugs causing bleeding complications near delivery.

Understanding the timing of fetal development is crucial for evaluating medication risks during pregnancy. The developing baby is not equally vulnerable to drug effects throughout the entire pregnancy. Different organ systems form at different times, creating specific windows of vulnerability. This concept, known as the critical period of organogenesis, is fundamental to teratology, the study of birth defects.

During the first two weeks after conception (roughly weeks 3-4 of pregnancy, counted from the last menstrual period), the embryo is a mass of undifferentiated cells. During this very early period, the principle of "all-or-nothing" generally applies: a harmful exposure either prevents implantation entirely (resulting in a very early, often unrecognized miscarriage) or the embryo fully recovers with no lasting damage. This is why many women who take medications before they know they are pregnant do not experience adverse effects.

The most vulnerable period begins around the third week after conception (gestational week 5) and continues through the end of the first trimester (approximately week 12). During this time, all major organ systems are forming: the heart, brain, limbs, eyes, ears, and other vital structures. Exposure to teratogenic substances during this window carries the highest risk of structural birth defects. The specific type of defect depends on which organ system is developing at the time of exposure.

After the first trimester, the risk of structural birth defects decreases significantly because most organs have already formed. However, the second and third trimesters bring different concerns. The brain continues to develop throughout pregnancy, so medications that affect the central nervous system may still carry risks. Some drugs can affect fetal growth, kidney function, or blood clotting in later pregnancy. Certain medications taken close to delivery can cause complications in the newborn, such as withdrawal symptoms, bleeding, or breathing difficulties.

The Role of the Placenta

The placenta develops during the first trimester and serves as the interface between the mother's blood and the baby's blood. While it provides essential nutrients and oxygen, it also allows most medications to pass through. The extent of transfer depends on the drug's molecular weight, fat solubility, and protein binding. Very large molecules like heparin and insulin do not cross the placenta readily, which is one reason these drugs are preferred for managing blood clotting and diabetes during pregnancy.

As pregnancy progresses, the placenta thins and blood flow increases, which can actually allow greater drug transfer in later pregnancy. This is another reason why timing matters when evaluating medication safety. A drug that is relatively safe in the first trimester because placental transfer is minimal may need re-evaluation in the third trimester when transfer is greater.

Why Is It Sometimes Dangerous to Stop Medication During Pregnancy?

Stopping certain medications abruptly during pregnancy can be more dangerous than continuing them. Untreated conditions such as epilepsy, severe depression, asthma, diabetes, and high blood pressure pose significant risks to both mother and baby, including seizures, preterm birth, organ damage, and fetal growth restriction.

One of the most important principles in pregnancy pharmacology is that the risk of a medication must always be weighed against the risk of the untreated condition. Many women, upon learning they are pregnant, instinctively want to stop all medications. While this impulse is understandable, it can sometimes lead to serious consequences for both the mother and the developing baby.

Epilepsy is a prime example of this principle. Anti-seizure medications carry teratogenic risks: valproic acid, for instance, is associated with neural tube defects in approximately 1-2% of exposed pregnancies and cognitive effects in a higher percentage. However, uncontrolled seizures during pregnancy, particularly generalized tonic-clonic seizures, can cause fetal hypoxia (oxygen deprivation), placental abruption, premature labor, and maternal death. The standard approach is to use the lowest effective dose of the safest available anti-epileptic drug, ideally transitioning to a lower-risk medication before conception.

Depression and anxiety are common during pregnancy, affecting approximately 10-15% of pregnant women. Untreated major depression during pregnancy is associated with poor prenatal care attendance, inadequate nutrition, substance use, preterm birth, low birth weight, and postpartum depression. Some antidepressants, particularly selective serotonin reuptake inhibitors (SSRIs) like sertraline, have been extensively studied in pregnancy and are generally considered to have a favorable risk-benefit ratio for women with moderate to severe depression.

Asthma that is poorly controlled during pregnancy increases the risk of preeclampsia, preterm birth, low birth weight, and cesarean delivery. Inhaled corticosteroids (such as budesonide) and short-acting beta-agonists (such as salbutamol) are considered safe during pregnancy. Stopping asthma medications can lead to poorly controlled disease, which poses greater risks to the fetus than the medications themselves.

Diabetes, whether pre-existing or gestational, requires careful management during pregnancy. Poorly controlled blood sugar levels are associated with birth defects (particularly heart and neural tube defects), macrosomia (excessively large baby), birth injuries, neonatal hypoglycemia, and stillbirth. Insulin is the preferred treatment because it does not cross the placenta. Metformin is increasingly used as well, though it does cross the placenta and long-term effects on offspring are still being studied.

Hypertension (high blood pressure) during pregnancy, if untreated, can lead to preeclampsia, placental abruption, stroke, and organ failure. Medications such as methyldopa, labetalol, and nifedipine are considered safe for treating high blood pressure during pregnancy. ACE inhibitors and angiotensin receptor blockers (ARBs), commonly used for hypertension in non-pregnant adults, are contraindicated during pregnancy because they can cause severe fetal kidney damage and other abnormalities.

Which Medications Should You Avoid During Pregnancy?

Known teratogenic medications that should be avoided during pregnancy include isotretinoin (acne treatment), methotrexate, warfarin, valproic acid, and ACE inhibitors. NSAIDs should be avoided after week 20, and high-dose vitamin A supplements are contraindicated. Some herbal remedies and supplements also carry risks.

While the majority of medications have not been proven to cause birth defects, a group of approximately 30 drugs are classified as known human teratogens, meaning they have strong evidence of causing birth defects when used during pregnancy. Understanding which medications fall into this category is essential for all women of reproductive age, not just those who are currently pregnant, because some drugs must be stopped well before conception to be safe.

Isotretinoin (sold under various brand names for severe acne) is one of the most potent known teratogens. Even a single dose during pregnancy can cause severe birth defects affecting the brain, heart, and face. Women who take isotretinoin are required to use two forms of contraception and undergo regular pregnancy tests during treatment. The drug must be stopped at least one month before attempting conception.

Methotrexate, used for autoimmune conditions and certain cancers, is a folate antagonist that interferes with cell division. It can cause multiple birth defects and miscarriage. Both women and men should stop methotrexate at least three months before attempting conception, as it can also affect sperm quality.

Warfarin (a blood thinner) is known to cause a characteristic pattern of birth defects called warfarin embryopathy when used during the first trimester, including nasal hypoplasia and skeletal abnormalities. Women who require anticoagulation during pregnancy are typically switched to heparin or low-molecular-weight heparin, which do not cross the placenta.

Valproic acid (sodium valproate), used for epilepsy and bipolar disorder, carries one of the highest teratogenic risks among commonly prescribed medications, including neural tube defects, heart defects, and cognitive impairment. Current guidelines recommend avoiding it in women of childbearing potential whenever alternatives are available.

ACE inhibitors and ARBs (ramipril, enalapril, losartan, valsartan) are effective blood pressure medications that are widely used in non-pregnant adults. However, they can cause severe fetal renal failure, oligohydramnios (low amniotic fluid), and limb defects, particularly when used in the second and third trimesters. Women planning pregnancy should be switched to pregnancy-safe alternatives like methyldopa, labetalol, or nifedipine.

Common Over-the-Counter Drugs to Avoid

Several commonly available over-the-counter medications should be avoided or used with caution during pregnancy:

• Aspirin (high-dose): High-dose aspirin can increase bleeding risk and affect fetal development. Low-dose aspirin (75-150 mg) may be prescribed by your doctor for preeclampsia prevention
• Ibuprofen and other NSAIDs: Risk of reduced amniotic fluid and premature closure of ductus arteriosus, especially after week 20
• Decongestants (pseudoephedrine): Some studies suggest a small increased risk of abdominal wall defects in the first trimester
• Bismuth subsalicylate: Contains salicylate (aspirin-like compound) and should be avoided
• High-dose vitamin A: Doses above 10,000 IU/day of retinol can cause birth defects

Herbal Remedies and Supplements

Many people assume that "natural" equals "safe," but this is not the case during pregnancy. Herbal supplements are not regulated as strictly as pharmaceutical drugs, and many have not been studied in pregnant women. Some herbs can stimulate uterine contractions, affect hormone levels, or interact with medications. Herbs that should generally be avoided during pregnancy include St. John's wort, black cohosh, dong quai, pennyroyal, and high-dose ginger supplements. Small amounts of ginger (such as ginger tea for nausea) are generally considered safe.

Which Medications Are Safe While Breastfeeding?

Most common medications are compatible with breastfeeding because only small amounts pass into breast milk. Paracetamol, ibuprofen, most penicillin antibiotics, and certain antihistamines are generally safe. The LactMed database is a reliable resource for checking individual drug compatibility with breastfeeding.

Medication use during breastfeeding raises different concerns than during pregnancy. When a mother takes a medication, the drug enters her bloodstream and may pass into breast milk. The amount that reaches the nursing infant depends on several factors: how much of the drug enters the milk, how much milk the baby consumes, and how the baby's immature liver and kidneys process the drug. In most cases, the infant receives less than 1-2% of the maternal dose, which is generally considered clinically insignificant.

The good news is that the vast majority of commonly used medications are compatible with breastfeeding. The benefits of breastfeeding for both mother and infant are well-established and significant, so the decision to stop breastfeeding due to medication use should be made carefully and only when truly necessary. In many cases, healthcare providers can find a breastfeeding-compatible alternative rather than advising cessation of breastfeeding.

The pharmacokinetics of drug transfer into breast milk differ from placental transfer. Key factors include the drug's molecular weight, protein binding, lipophilicity, and oral bioavailability. Timing of feeds relative to drug dosing can also reduce infant exposure. For some medications, the mother can take the drug immediately after a feed and before the longest sleep interval to minimize the amount in milk at the next feed.

The LactMed database, maintained by the National Library of Medicine, is the gold standard resource for information about medication safety during breastfeeding. It provides peer-reviewed data on the effects of medications on nursing infants and includes alternative drugs to consider. Healthcare providers and mothers can access it freely online.

Safe Medications While Breastfeeding

The following categories of medications are generally considered compatible with breastfeeding, based on extensive research and clinical experience:

• Paracetamol (acetaminophen): Very low transfer into breast milk; widely considered the safest analgesic for breastfeeding mothers
• Ibuprofen: Unlike in pregnancy, ibuprofen is considered safe during breastfeeding due to minimal milk transfer and short half-life
• Penicillin-type antibiotics: Amoxicillin, ampicillin, and penicillin V transfer in very small amounts and are safe
• Cephalosporins: Cephalexin and similar drugs are compatible with breastfeeding
• Loratadine and cetirizine: Non-sedating antihistamines that are preferred over older, sedating types
• Inhaled corticosteroids: For asthma management; negligible systemic absorption means minimal milk transfer
• Insulin: Not absorbed orally, so even if present in milk, it would be destroyed in the infant's digestive tract

Medications That Require Caution

Some medications may be used during breastfeeding with appropriate monitoring and caution. Sedating antihistamines like diphenhydramine can cause drowsiness in the infant. Codeine should generally be avoided, as some individuals are ultra-rapid metabolizers who convert codeine to morphine very quickly, potentially leading to dangerously high levels in breast milk. Certain antidepressants are generally compatible with breastfeeding, but sertraline and paroxetine are preferred because they produce the lowest levels in breast milk.

Medications that are generally contraindicated during breastfeeding include radioactive iodine, cytotoxic chemotherapy agents, ergotamine, and illicit drugs. For these medications, temporary or permanent cessation of breastfeeding is necessary. In some cases, "pump and dump" strategies can be used for short-course medications while maintaining milk supply.

How Should Common Pregnancy Complaints Be Treated?

Common pregnancy complaints such as nausea, heartburn, headaches, and infections can usually be safely managed. For morning sickness, ginger and doxylamine-pyridoxine (vitamin B6) are first-line treatments. Antacids containing calcium or magnesium are safe for heartburn. Urinary tract infections should be treated promptly with pregnancy-safe antibiotics.

Pregnancy brings a wide range of physical complaints that may require treatment. The good news is that for most common pregnancy ailments, safe and effective treatment options exist. The key is knowing which treatments to use and which to avoid, and always confirming with your healthcare provider before taking any medication, even over-the-counter products.

Nausea and vomiting (morning sickness) affects up to 80% of pregnant women, typically peaking between weeks 8 and 12. First-line treatment options include dietary modifications (small, frequent meals; avoiding trigger foods), ginger (in moderate amounts, such as ginger tea or ginger capsules up to 1 gram per day), and vitamin B6 (pyridoxine) at doses of 10-25 mg three times daily. The combination of doxylamine and pyridoxine (vitamin B6) is approved in many countries specifically for treating nausea in pregnancy and has extensive safety data. For severe nausea (hyperemesis gravidarum), prescription antiemetics such as ondansetron may be used under medical supervision, though ondansetron's safety in the first trimester is still debated.

Heartburn and acid reflux are extremely common in pregnancy, particularly in the second and third trimesters, as the growing uterus puts pressure on the stomach and pregnancy hormones relax the esophageal sphincter. Antacids containing calcium carbonate or magnesium hydroxide are considered safe first-line treatments. Ranitidine (H2 blocker) was widely used but has been withdrawn from many markets; famotidine is an alternative. Proton pump inhibitors such as omeprazole are generally considered safe when antacids are insufficient, though they are usually reserved for more severe cases.

Headaches are common during pregnancy, especially in the first trimester. Paracetamol is the recommended treatment. Adequate hydration, rest, and stress management are important non-pharmacological approaches. Migraine sufferers should discuss their treatment plan with their healthcare provider, as some migraine medications (such as triptans and ergotamine) have limited safety data in pregnancy.

Urinary tract infections (UTIs) are more common during pregnancy due to hormonal changes that affect the urinary tract. UTIs during pregnancy should always be treated, even if asymptomatic (asymptomatic bacteriuria), because untreated infections can lead to kidney infection (pyelonephritis) and preterm birth. Safe antibiotics for UTIs in pregnancy include amoxicillin, cephalexin, and nitrofurantoin (the latter is generally avoided in the first trimester and near term).

Constipation affects up to 40% of pregnant women due to hormonal effects on gut motility and iron supplementation. First-line treatment involves dietary measures (increased fiber and fluid intake) and exercise. If these are insufficient, bulk-forming laxatives such as psyllium (Metamucil) are safest, followed by osmotic laxatives like lactulose or polyethylene glycol (Miralax). Stimulant laxatives (senna, bisacodyl) should be used sparingly and only short-term.

Allergies and Nasal Congestion

Pregnancy rhinitis and seasonal allergies are common. Saline nasal sprays are the safest first option. Among antihistamines, loratadine and cetirizine are preferred because they are non-sedating and have good safety data in pregnancy. Older sedating antihistamines like chlorpheniramine may also be used. Intranasal corticosteroids like budesonide are considered safe and effective for persistent symptoms. Oral decongestants such as pseudoephedrine should be used with caution, particularly in the first trimester.

How Are Chronic Conditions Managed During Pregnancy?

Women with chronic conditions such as epilepsy, diabetes, thyroid disorders, and mental health conditions need careful medication management before and during pregnancy. Pre-conception planning with a healthcare provider is ideal, allowing time to switch to pregnancy-safe alternatives and optimize dosing before conception.

Managing chronic medical conditions during pregnancy requires a careful, individualized approach. Ideally, women with chronic conditions should discuss their medication regimen with their healthcare provider before becoming pregnant, allowing time to transition to safer alternatives if needed. This pre-conception counseling is one of the most effective strategies for reducing medication-related risks during pregnancy.

Thyroid disorders are among the most common endocrine conditions in women of reproductive age. Both hypothyroidism and hyperthyroidism can affect pregnancy outcomes if not properly treated. Levothyroxine for hypothyroidism is safe during pregnancy and often needs dose increases of 25-50% during the first trimester. Propylthiouracil (PTU) is preferred for treating hyperthyroidism in the first trimester, while methimazole may be used in the second and third trimesters. Methimazole is generally avoided in the first trimester due to a rare risk of specific birth defects.

Epilepsy management during pregnancy is complex because all anti-seizure medications carry some degree of teratogenic risk, but uncontrolled seizures are also dangerous. The safest approach involves pre-pregnancy optimization: using monotherapy (a single medication) at the lowest effective dose, choosing drugs with the best safety profiles (lamotrigine and levetiracetam are generally preferred), and taking high-dose folic acid (4-5 mg/day). Valproic acid carries the highest risk and should be avoided whenever possible.

Mental health conditions including depression, anxiety, and bipolar disorder require thoughtful management during pregnancy. For depression, sertraline is one of the best-studied SSRIs in pregnancy with a relatively favorable safety profile. Cognitive behavioral therapy (CBT) should be considered as a first-line or adjunctive treatment. For bipolar disorder, lithium carries a small increased risk of cardiac defects (particularly Ebstein anomaly) but may be necessary for women with severe illness. Valproic acid and carbamazepine should be avoided if alternatives exist.

Autoimmune conditions such as rheumatoid arthritis, lupus, and inflammatory bowel disease often require ongoing immunosuppressive therapy. Azathioprine is generally considered compatible with pregnancy and is one of the preferred immunosuppressants. Hydroxychloroquine is safe and in fact recommended to continue during pregnancy for women with lupus, as stopping it increases the risk of disease flares. Methotrexate, mycophenolate, and cyclophosphamide are contraindicated and must be stopped well before conception.

What If You Took Medication Before Knowing You Were Pregnant?

If you took medication before realizing you were pregnant, do not panic. Exposure during the first two weeks after conception usually follows an all-or-nothing pattern with low risk of birth defects. Contact your healthcare provider as soon as possible to discuss the specific medication, dose, and timing. Do not stop prescribed medications abruptly.

One of the most common concerns women face is having taken a medication before realizing they were pregnant. This situation is extremely common because approximately half of all pregnancies worldwide are unplanned, and many women do not discover their pregnancy until several weeks after conception. Understanding the biology of early pregnancy development can help alleviate some of the anxiety surrounding early medication exposure.

As discussed earlier, the first two weeks after conception (before a missed period) are generally considered a period of lower risk for structural birth defects. During this time, the fertilized egg has not yet implanted in the uterine wall and the cells have not begun to differentiate into specific organs. An exposure that is toxic enough to damage the embryo at this stage usually prevents successful implantation rather than causing a birth defect.

The critical period for birth defects begins around 17 days after conception (approximately the 5th week of pregnancy by gestational dating). From this point through the end of the first trimester, specific organ systems are developing and are vulnerable to teratogenic effects. However, even during this critical period, the vast majority of medications do not cause birth defects. Only about 30 drugs are known human teratogens, and the absolute risk of birth defects for most of these is still relatively low (though higher than the background rate).

If you discover you are pregnant and have been taking medication, the most important steps are:

1. Do not panic - the absolute risk for most medications is low
2. Do not stop prescription medication abruptly - sudden withdrawal can be dangerous
3. Contact your healthcare provider promptly - discuss the specific medication, dose, and timing of exposure
4. Gather information - know the name and dose of the medication and when you took it
5. Follow medical advice - your provider may recommend additional monitoring, dose adjustment, or switching to a different drug

In some countries, specialized teratology information services provide free phone consultations for healthcare providers and patients about specific medication exposures during pregnancy. These services can provide individualized risk assessments based on the most current evidence. The Organization of Teratology Information Specialists (OTIS) in North America and similar services in Europe are valuable resources.

What Are the Best Practices for Medication Use During Pregnancy?

Best practices include discussing all medications with your healthcare provider, using the lowest effective dose for the shortest time, choosing well-studied medications over newer ones, maintaining a complete medication list, and never stopping prescribed medication without medical advice.

Whether you are planning a pregnancy, currently pregnant, or breastfeeding, following evidence-based practices for medication use can help you and your baby stay safe. These guidelines are endorsed by organizations including the World Health Organization, the American College of Obstetricians and Gynecologists, and the European Medicines Agency.

The cornerstone principle is informed decision-making in partnership with your healthcare provider. Every medication decision during pregnancy involves a trade-off between the potential risks of the drug and the potential risks of leaving the condition untreated. Neither extreme - taking medications carelessly nor avoiding all medications out of fear - serves the best interests of mother and baby.

Maintain a complete medication list that includes all prescription drugs, over-the-counter medications, vitamins, supplements, and herbal products. Share this list with every healthcare provider you see during your pregnancy, including your dentist and any specialists. Keep the list updated as medications change.

Use the lowest effective dose for the shortest time needed. This principle applies to both prescription and over-the-counter medications. For example, if paracetamol relieves your headache at 500 mg, there is no reason to take 1,000 mg. If a short course of antibiotics cures your infection, do not continue beyond the prescribed duration.

Choose well-established medications over newer drugs when possible. Older medications have more safety data available from years of use in pregnant women. A new drug may be more effective or have fewer side effects in general, but if it has limited pregnancy safety data, a well-studied older alternative is usually the wiser choice during pregnancy.

Time your medication thoughtfully when possible. For some drugs, adjusting the timing of doses relative to meals, sleep, or breastfeeding sessions can reduce unnecessary exposure. Your pharmacist or healthcare provider can advise on optimal timing for specific medications.

• Before pregnancy: Review all medications with your provider; switch to safe alternatives; start folic acid 400 mcg daily
• During pregnancy: Inform all providers you are pregnant; avoid self-medicating; attend all prenatal checkups
• While breastfeeding: Check LactMed database; time doses after feeds when possible; watch for infant side effects (drowsiness, poor feeding, rash)
• Always: Keep a complete medication list; never stop prescribed medication without medical advice; report any concerns promptly