Amotaks (Amoxicillin): Uses, Dosage & Side Effects

What Is Amotaks and What Is It Used For?

Amotaks is a branded formulation of amoxicillin, a broad-spectrum, semi-synthetic aminopenicillin antibiotic that has been in clinical use worldwide since the early 1970s. Manufactured by Tarchomińskie Zakłady Farmaceutyczne “Polfa” S.A. in Warsaw, Poland, Amotaks is available as scored tablets in three strengths: 500 mg, 750 mg, and 1 g. The active substance is amoxicillin in the form of amoxicillin trihydrate, a stable salt that ensures reliable oral absorption.

Amoxicillin was developed as an improvement over the earlier aminopenicillin ampicillin, offering superior oral bioavailability (approximately 70–80% compared to 40–50% for ampicillin). This higher bioavailability means a greater proportion of each oral dose reaches the bloodstream, resulting in more reliable therapeutic drug levels. Importantly, food does not significantly affect the absorption of amoxicillin, making Amotaks convenient to take before, during, or after meals.

The medication works by a bactericidal mechanism: it inhibits the synthesis of bacterial cell walls by binding to penicillin-binding proteins (PBPs). These enzymes are essential for the cross-linking of peptidoglycan chains that provide structural integrity to bacterial cell walls. When amoxicillin blocks these enzymes, the bacterial cell wall becomes weakened and unstable, leading to osmotic lysis and bacterial death. Because human cells do not possess peptidoglycan cell walls, amoxicillin is selectively toxic to bacteria with relatively few effects on human tissues.

Amoxicillin demonstrates activity against a broad range of both Gram-positive and Gram-negative bacteria. It is particularly effective against Streptococcus pneumoniae, Streptococcus pyogenes (Group A streptococcus), Enterococcus faecalis, Haemophilus influenzae (non-beta-lactamase producing), Escherichia coli (non-beta-lactamase producing), Proteus mirabilis, and Helicobacter pylori. However, many bacteria produce beta-lactamase enzymes that can break down amoxicillin, rendering it ineffective. For infections caused by beta-lactamase-producing organisms, amoxicillin is sometimes combined with clavulanic acid (a beta-lactamase inhibitor) in a separate formulation known as co-amoxiclav.

According to the approved product information, Amotaks is indicated for the treatment of the following conditions:

• Acute bacterial sinusitis: Bacterial infection of the paranasal sinuses, characterized by facial pain, nasal congestion, and purulent discharge lasting more than 10 days or worsening after initial improvement.
• Acute otitis media: Middle ear infection, one of the most common childhood bacterial infections, causing ear pain, fever, and sometimes hearing difficulty.
• Acute streptococcal pharyngitis and tonsillitis: Sore throat and tonsillar infection caused by Group A Streptococcus pyogenes, requiring antibiotic treatment to prevent rheumatic fever and other complications.
• Acute exacerbation of chronic bronchitis: Worsening of chronic obstructive airway disease with increased sputum production, purulence, or breathlessness, when bacterial infection is suspected.
• Community-acquired pneumonia: Lung infection acquired outside hospital settings; amoxicillin is a first-line treatment for mild to moderate cases according to major international guidelines.
• Acute cystitis: Uncomplicated lower urinary tract infection (bladder infection), presenting with frequency, urgency, and pain on urination.
• Asymptomatic bacteriuria in pregnancy: The presence of bacteria in urine during pregnancy without symptoms, which requires treatment to prevent pyelonephritis and adverse pregnancy outcomes.
• Acute pyelonephritis: Upper urinary tract infection (kidney infection) causing fever, flank pain, and systemic illness.
• Typhoid and paratyphoid fever: Systemic infections caused by Salmonella typhi and Salmonella paratyphi, endemic in many tropical and subtropical regions.
• Dental abscess with spreading cellulitis: Bacterial infection originating from a tooth, spreading to surrounding soft tissues, requiring antibiotic treatment alongside dental intervention.
• Prosthetic joint infection: Infections associated with joint replacement surgery, where amoxicillin may be used as part of a combination regimen.
• Helicobacter pylori eradication: Used in combination with a proton pump inhibitor (such as omeprazole) and another antibiotic (such as clarithromycin or metronidazole) for the treatment of peptic ulcer disease caused by H. pylori.
• Lyme disease (borreliosis): Treatment of early-stage Lyme disease (erythema migrans) and late-stage systemic disease caused by Borrelia burgdorferi.
• Endocarditis prophylaxis: Prevention of infective endocarditis before certain dental or surgical procedures in patients at high risk of developing heart valve infection.

Amoxicillin is included on the World Health Organization (WHO) Model List of Essential Medicines, underscoring its fundamental importance in global healthcare. It is classified as an Access antibiotic under the WHO AWaRe (Access, Watch, Reserve) classification system, meaning it should be widely available as a first-line treatment while being used responsibly to minimize the development of antibiotic resistance.

What Should You Know Before Taking Amotaks?

Contraindications

There are specific situations where Amotaks must not be used. Understanding these absolute contraindications is essential for safe medication use and for preventing potentially life-threatening reactions.

• Penicillin allergy: Do not take Amotaks if you are allergic to amoxicillin, penicillin, or any other ingredient in the tablets. Penicillin allergy can cause reactions ranging from mild skin rash to life-threatening anaphylaxis. If you have a confirmed penicillin allergy, you must avoid all penicillin-type antibiotics.
• Previous allergic reaction to any antibiotic: If you have previously experienced an allergic reaction to any antibiotic (such as a skin rash, facial swelling, or difficulty breathing), you should inform your doctor before starting Amotaks, as cross-reactivity between antibiotic classes can occur.

Warnings and Precautions

Before taking Amotaks, it is important to discuss certain medical conditions and circumstances with your doctor or pharmacist, as they may affect the safety or dosing of this medication.

• Glandular fever (infectious mononucleosis): If you have glandular fever (Epstein-Barr virus infection), characterized by fever, sore throat, swollen lymph nodes, and extreme fatigue, taking amoxicillin carries a high risk of developing a widespread maculopapular rash. This rash affects up to 70–100% of patients with mononucleosis who take amoxicillin and, while not a true allergic reaction, can be extensive and distressing. Your doctor should consider alternative diagnoses before prescribing Amotaks for throat infections.
• Kidney disease: If you have reduced kidney function (renal impairment), your doctor may need to adjust the dose of Amotaks or the interval between doses. Amoxicillin is primarily excreted through the kidneys, and impaired renal function can lead to accumulation of the drug in the body, increasing the risk of adverse effects including seizures.
• Irregular urination: If you do not urinate at regular intervals, adequate fluid intake is important to reduce the risk of amoxicillin crystal formation in the urine (crystalluria), which can cause acute kidney injury.
• Prolonged treatment: If you take Amotaks for an extended period, your doctor may want to perform additional tests to monitor your kidney function, liver function, and blood counts, as long-term antibiotic use can occasionally affect these parameters.

Effects on Laboratory Tests

Amotaks can interfere with certain laboratory test results. It is important to inform your doctor or the laboratory that you are taking amoxicillin if you are undergoing any of the following tests:

• Urine glucose tests: Amoxicillin can cause false-positive results in non-enzymatic urine glucose tests (such as the Clinitest method). If you need to test your urine for glucose, enzymatic methods (such as glucose oxidase strips) should be used instead.
• Liver function tests: Blood tests measuring liver enzymes (transaminases) may show elevated values during amoxicillin treatment, which may not necessarily indicate liver damage but should be monitored.
• Estriol tests in pregnancy: Amoxicillin can interfere with urinary estriol measurements, which are sometimes used during pregnancy to assess fetal well-being. Alternative monitoring methods should be discussed with your obstetrician.

Pregnancy and Breastfeeding

Amoxicillin (the active ingredient in Amotaks) is one of the most extensively studied antibiotics in pregnancy and is generally considered safe when clinically indicated. It is classified as a category B drug by the FDA, meaning that animal reproduction studies have not demonstrated a risk to the fetus, and there are adequate well-controlled studies in pregnant women showing no increased risk of birth defects.

Amoxicillin is one of the first-line antibiotics recommended for treating urinary tract infections in pregnancy, including asymptomatic bacteriuria, which if left untreated can progress to pyelonephritis and increase the risk of preterm delivery. The decision to use Amotaks during pregnancy should always be made in consultation with your healthcare provider, weighing the benefits of treating the infection against any potential risks.

Small amounts of amoxicillin pass into breast milk, but these quantities are generally not considered harmful to the nursing infant. The main concern is a theoretical risk of sensitization (developing an allergy) or disruption of the infant's gut flora, which could cause diarrhea or thrush. If your breastfed infant develops diarrhea, skin rash, or oral thrush while you are taking Amotaks, consult your doctor.

Driving and Operating Machinery

Amotaks can cause side effects such as dizziness, allergic reactions, and (very rarely) seizures, which could affect your ability to drive or operate machinery. Do not drive or use machines if you experience any of these effects. You are responsible for assessing your own fitness to drive and should consider all potential medication effects described in this information.

Important Information About Excipients

Amotaks tablets contain certain excipients (inactive ingredients) that may be relevant for some patients:

• Aspartam (E 951): Each 1 g Amotaks tablet contains 6.80 mg of aspartam. Aspartam is a source of phenylalanine. This is important for people with phenylketonuria (PKU), a rare inherited metabolic disorder in which the body cannot properly process phenylalanine, leading to its accumulation. If you have PKU, discuss the use of Amotaks with your doctor. The maximum recommended dose of Amotaks corresponds to a maximum of 20.4 mg of aspartam per dose and 40.8 mg per day.
• Glucose: Each 1 g tablet contains approximately 3.1 mg of glucose, derived from the flavoring agents (strawberry, raspberry, and tropical fruit flavors). If your doctor has told you that you have an intolerance to certain sugars, consult your doctor before taking Amotaks.

How Does Amotaks Interact with Other Drugs?

Drug interactions can affect how Amotaks works or increase the risk of side effects. It is essential to tell your doctor or pharmacist about all medications you are currently taking, have recently taken, or may be planning to take, including prescription drugs, over-the-counter medications, vitamins, and herbal supplements. The following table summarizes the most clinically significant interactions with amoxicillin.

Major Interactions

Moderate Interactions

Minor Interactions

In addition to the interactions listed above, the following points are worth noting:

• Oral contraceptives: While traditional teaching suggested that antibiotics like amoxicillin reduce the effectiveness of oral contraceptive pills, current evidence indicates that non-enzyme-inducing antibiotics do not significantly reduce contraceptive efficacy. However, if amoxicillin causes vomiting or severe diarrhea, absorption of the contraceptive pill may be impaired, and additional barrier contraception should be used.
• Mycophenolate mofetil: Amoxicillin may reduce the bioavailability of mycophenolate mofetil (an immunosuppressant) by disrupting the enterohepatic recirculation of the active metabolite. Patients on mycophenolate should be monitored for signs of graft rejection.
• Vitamin K antagonists: All antibiotics that alter gut flora can theoretically affect the production of vitamin K by gut bacteria, potentially enhancing the effect of vitamin K antagonist anticoagulants. Close monitoring of coagulation parameters is advisable.

What Is the Correct Dosage of Amotaks?

Amotaks should always be taken exactly as prescribed by your doctor. The dose, frequency, and duration of treatment depend on the type and severity of the infection, the patient's age and body weight, and renal function. Amotaks tablets have a score line and can be split into two equal halves. The tablets can be swallowed whole (or crushed) with a glass of water, or dissolved in a small amount of cold water to create a suspension that should be drunk immediately. Amotaks can be taken before, during, or after a meal. Doses should be spaced evenly throughout the day, with at least 4 hours between each dose.

Adults, Elderly Patients, and Children Weighing 40 kg or More

Children (Under 40 kg Body Weight)

Renal Impairment

Missed Dose

If you forget to take a dose of Amotaks, take it as soon as you remember. However, do not take the next dose too soon — wait approximately 4 hours before taking the next scheduled dose. Do not take a double dose to make up for a missed one. Maintaining consistent dosing helps keep effective antibiotic levels in your bloodstream, which is essential for successfully treating the infection.

Overdose

If you take more Amotaks than prescribed, you may experience gastrointestinal symptoms such as nausea, vomiting, and diarrhea. High doses can also cause crystalluria (amoxicillin crystals forming in the urine), which may manifest as cloudy urine or difficulty urinating. If you suspect an overdose, contact your doctor, local emergency services, or a poison control center immediately. Take the medication packaging with you so that medical professionals can identify exactly what was taken.

Treatment Duration

Continue taking Amotaks for the full duration prescribed by your doctor, even if your symptoms improve before the course is completed. All doses are needed to fully eliminate the infecting bacteria. If treatment is stopped prematurely, surviving bacteria can multiply and cause the infection to return, potentially with reduced antibiotic sensitivity.

If you use Amotaks for an extended period, be aware that opportunistic yeast infections (thrush) may develop, particularly oral candidiasis (white patches in the mouth) or vaginal candidiasis (itching, discharge). If you notice these symptoms, contact your doctor for appropriate antifungal treatment.

What Are the Side Effects of Amotaks?

Like all medicines, Amotaks can cause side effects, although not everyone experiences them. Most side effects are mild, transient, and resolve after the treatment course is completed or the medication is stopped. The following section classifies potential side effects by frequency, based on data from regulatory authorities, clinical trials, and post-marketing surveillance. If you experience any side effect not listed here, or if any listed effect becomes severe, contact your doctor or pharmacist.

It is important to distinguish between a true penicillin allergy and non-allergic side effects. A maculopapular (flat, widespread) rash that develops gradually over several days is usually non-allergic, particularly in the context of infectious mononucleosis or concurrent allopurinol use. In contrast, urticaria (hives), angioedema, or anaphylaxis developing within minutes to hours of taking Amotaks strongly suggests a true IgE-mediated allergic reaction. If you are uncertain whether a reaction is allergic, stop taking the medication and consult your doctor promptly, as this distinction has critical implications for future antibiotic prescribing.

Jarisch-Herxheimer Reaction

When Amotaks is used to treat Lyme disease (borreliosis), a temporary worsening of symptoms known as the Jarisch-Herxheimer reaction may occur within the first 24 hours of treatment. This reaction is caused by the release of bacterial components as the bacteria are killed and typically presents with fever, chills, muscle pain, headache, and a temporary worsening of any skin rash. The reaction is self-limiting and usually resolves within 24–48 hours. It does not indicate an allergy to the medication, and treatment should generally be continued.

If you experience any adverse effects while taking Amotaks, you can report them to your national pharmacovigilance authority (e.g., the MHRA Yellow Card scheme in the UK, the FDA MedWatch program in the US, or the EMA EudraVigilance system in Europe). Reporting side effects helps monitor the ongoing safety of medicines and contributes to public health.

How Should You Store Amotaks?

Proper storage of Amotaks is essential to ensure the medication remains effective and safe throughout its use. The following guidelines should be observed:

• Temperature: Store at room temperature, below 25°C (77°F). Do not refrigerate or freeze the tablets. Avoid storing in places that experience temperature extremes, such as near radiators, in direct sunlight, or in the bathroom.
• Moisture protection: Amotaks tablets are moisture-sensitive. Keep them in the original blister packaging or HDPE container with the lid tightly closed until you are ready to take a dose. Do not transfer tablets to other containers unless they provide equivalent moisture protection.
• Child safety: Keep all medicines securely out of the sight and reach of children. Amotaks tablets have fruity flavoring and could be attractive to children. Store in a high, locked cabinet or medicine cupboard.
• Expiry date: Do not use Amotaks after the expiry date (EXP) printed on the blister pack or container. The expiry date refers to the last day of the stated month. If the tablets appear discolored, crumbled, or have an unusual smell, do not take them and consult your pharmacist.
• Disposal: Do not dispose of unused or expired Amotaks tablets via household waste or down drains. Return unused medication to your local pharmacy for environmentally safe disposal. This helps protect the environment and prevent accidental exposure.

What Does Amotaks Contain?

Active Ingredient

The active substance in Amotaks is amoxicillin, present in the form of amoxicillin trihydrate. Each Amotaks 1 g tablet contains 1 g (1,000 mg) of amoxicillin. The trihydrate form is a stable crystalline salt that ensures consistent dissolution and absorption in the gastrointestinal tract, providing reliable oral bioavailability of approximately 70–80%.

Inactive Ingredients (Excipients)

In addition to the active ingredient, Amotaks tablets contain the following excipients that serve important functions in the tablet formulation:

• Microcrystalline cellulose: A commonly used pharmaceutical excipient that acts as a binder and filler, giving the tablet its structural integrity and enabling it to be compressed into a solid dosage form.
• Crospovidone: A superdisintegrant that helps the tablet break apart rapidly when exposed to water or gastric fluid, promoting quick drug release and absorption.
• Magnesium stearate: A lubricant used in tablet manufacturing to prevent the powder from sticking to the compression machinery and to ensure smooth tablet surfaces.
• Flavoring agents: Strawberry, raspberry, and tropical fruit flavors (containing maltodextrin, glucose, acacia gum [E 414], and pectin [E 440]) that improve the palatability of the tablets, particularly when dissolved in water.
• Aspartam (E 951): An artificial sweetener and source of phenylalanine. Each 1 g tablet contains 6.80 mg of aspartam. Important for patients with phenylketonuria (PKU).

Physical Appearance and Packaging

Amotaks tablets are nearly white to cream-colored, oval-shaped, biconvex tablets with a score line in the center that allows them to be divided into two equal halves. The tablets are available in the following packaging configurations:

• Amotaks 500 mg and 750 mg: Blister packs containing 16 or 20 tablets.
• Amotaks 1 g: Blister packs containing 16 or 20 tablets, or HDPE containers with screw caps containing 20 tablets.