Tylenol - Comprehensive Usage Guide: instructions, indications, composition, side effects
Composition
- Active Ingredient: Acetaminophen (also known as paracetamol)
- Excipients: May include croscarmellose sodium, crospovidone, povidone, pregelatinized starch, and other inactive ingredients depending on the formulation.
Official Forms
- Tablets: Available in various strengths, including 325 mg, 500 mg, and 650 mg tablets.
- Liquid Suspension: Available in various concentrations, typically 160 mg/5 mL or 500 mg/15 mL.
Pharmacological Group
- Tylenol belongs to the pharmacological group of analgesics and antipyretics (ATC code: N02BE01).
Pharmacological Properties
- Pharmacodynamics: Acetaminophen exerts its analgesic and antipyretic effects by inhibiting the synthesis of prostaglandins in the central nervous system, primarily in the hypothalamus. It is believed to act mainly through the COX-3 enzyme pathway.
- Pharmacokinetics: After oral administration, acetaminophen is rapidly absorbed from the gastrointestinal tract, reaching peak plasma concentrations within 30 to 60 minutes. It is primarily metabolized in the liver and excreted in the urine as glucuronide and sulfate conjugates.
Indications
- Tylenol is indicated for the relief of mild to moderate pain, including headaches, toothaches, muscle aches, menstrual cramps, and pain associated with arthritis.
- It is also used for the reduction of fever in adults and children.
Contraindications
- Tylenol is contraindicated in individuals with a known allergy or hypersensitivity to acetaminophen or any other component of the formulation.
- It should not be used in patients with severe liver disease or a history of alcohol abuse.
Interactions
- Acetaminophen may interact with certain medications, including warfarin, carbamazepine, phenytoin, and other drugs metabolized by the liver. Concurrent use may affect the metabolism of these medications and increase the risk of adverse effects.
- Caution is advised when combining Tylenol with other products containing acetaminophen to avoid exceeding the recommended maximum daily dose and reduce the risk of liver damage.
Specifics of Use
- Tylenol tablets should be taken orally with a full glass of water. They can be taken with or without food.
- The liquid suspension should be shaken well before each use and administered using the provided measuring device or syringe.
- Dosage adjustments may be necessary in elderly patients, patients with liver impairment, or those weighing less than 50 kg.
Pregnancy and Breastfeeding
- Tylenol is generally considered safe for use during pregnancy and breastfeeding when used at recommended doses. However, consultation with a healthcare provider is recommended before use, especially during the first trimester.
- It is excreted in breast milk but is unlikely to cause harm to nursing infants when used as directed.
Dosage and Administration
- The dosage of Tylenol varies depending on the age, weight, and condition being treated. Healthcare providers will determine the appropriate dose and frequency of administration.
- It is important not to exceed the maximum recommended daily dose to avoid the risk of liver damage.
Overdose
- Accidental overdose of acetaminophen can cause severe liver damage and even be fatal. Prompt medical attention is required in cases of overdose, even if symptoms are not immediately apparent.
- The antidote for acetaminophen overdose, N-acetylcysteine, is most effective when administered within 8 to 10 hours after ingestion.
Side Effects
- Common side effects of Tylenol may include nausea, vomiting, upset stomach, and rash. Serious adverse effects such as liver toxicity are rare but require immediate medical attention if they occur.
Storage and Shelf Life
- Store Tylenol tablets at room temperature (15-30°C) in a dry place, protected from light and moisture.
- Liquid suspension should be stored according to the manufacturer’s instructions, typically at controlled room temperature.
Consultation
- Always consult a healthcare professional before starting or discontinuing any medication, especially if you have underlying health conditions or are taking other medications. Follow their instructions carefully for safe and effective treatment with Tylenol.