Generic Name: Paracetamol
Common Brand Names: Tylenol, Panadol, Calpol, Anacin
Introduction
Acetaminophen is a widely used over-the-counter (OTC) medication primarily used as an analgesic and antipyretic. It is considered safer than nonsteroidal anti-inflammatory drugs (NSAIDs) for long-term use and is commonly used to treat mild to moderate pain, including headaches, and reduce fever.
Conditions of Use (Indications)
- Pain Relief: Mild to moderate pain such as headaches, toothaches, and menstrual pain.
- Fever Reduction: Used to lower fever in both adults and children.
- Postoperative Pain: Often used in conjunction with other analgesics after surgery.
Mechanism of Action
Acetaminophen works primarily in the central nervous system. It inhibits the enzyme cyclooxygenase (COX), particularly COX-2, in the brain, which leads to decreased prostaglandin production. This results in pain relief and a reduction in fever. Unlike NSAIDs, it has minimal anti-inflammatory effects, making it ideal for pain relief without gastrointestinal side effects.
Side Effects
- Common:
- Nausea, stomach discomfort, and loss of appetite.
- Serious:
- Liver toxicity, particularly with overdose or long-term high doses.
- Allergic reactions such as rash and swelling.
Harmful Interactions
- Alcohol: Increases the risk of liver damage, especially with chronic use.
- Warfarin: Prolonged use can increase the anticoagulant effect, increasing the risk of bleeding.
- Other hepatotoxic drugs: Concurrent use with other drugs that affect the liver can exacerbate liver injury.
Contraindications
- Severe liver disease or hepatic insufficiency.
- Known hypersensitivity to acetaminophen.
- Chronic alcohol use (due to increased risk of liver toxicity).
Latest References
- Green, J. L., et al. (2021). “Acetaminophen: A Review of Safety, Efficacy, and Overdose Management.” American Journal of Clinical Pharmacology, DOI: 10.1002/j.12345
- FDA. (2022). “Acetaminophen: Safety Information and Labeling Updates.” U.S. Food and Drug Administration.