Bufen-SR300 mg

Bufen-SR 300 mg is indicated for the short-term relief of mild to moderate pain and inflammation, including:

• Headache and migraine
• Toothache and dental pain
• Muscle aches, sprains, and strains
• Back pain
• Fever associated with cold, flu, and infections
• Primary dysmenorrhoea (menstrual cramps)
• Rheumatoid arthritis and osteoarthritis
• Ankylosing spondylitis and other rheumatic conditions
• Juvenile rheumatoid arthritis (in appropriate pediatric doses)
• Post-operative and minor injury-related pain

Bufen-SR 300 mg is one of the most widely used non-steroidal anti-inflammatory drugs (NSAIDs), trusted worldwide for relieving pain, reducing fever, and controlling inflammation. It belongs to the propionic acid derivative class of NSAIDs and works by blocking the enzyme cyclooxygenase (COX), which is responsible for producing prostaglandins — chemical messengers in the body that trigger pain, swelling, and fever.

Available as tablets, sustained-release (SR) capsules, and oral suspension, Bufen-SR 300 mg is commonly used to manage headaches, muscle pain, toothache, menstrual cramps, arthritis, and fever associated with common infections. It is available both as a prescription and over-the-counter medicine in Bangladesh under various brand names.

Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) — Propionic Acid Derivatives

Bufen-SR 300 mg exerts strong anti-inflammatory, antipyretic, and analgesic effects. It works mainly by inhibiting the cyclooxygenase (COX-1 and COX-2) enzymes, which significantly reduces the synthesis of prostaglandins — the compounds responsible for pain signaling, inflammation, and fever generation in the body.

In addition to COX inhibition, Bufen-SR 300 mg also suppresses certain lipoxygenase pathway products, contributing to its anti-inflammatory action. Its analgesic effect operates through both peripheral (at the site of injury) and central (nervous system) mechanisms. This dual action allows Bufen-SR 300 mg to quickly relieve pain and stiffness, reduce swelling, and improve joint mobility in patients with arthritis and other inflammatory conditions.

Bufen-SR 300 mg may interact with several medications, increasing the risk of side effects or reducing effectiveness. Caution and medical supervision are advised when combining Bufen-SR 300 mg with:

• Acetylsalicylic acid (Aspirin) — concurrent use is not recommended
• Other NSAIDs (increased risk of gastrointestinal bleeding and ulceration)
• High-dose Methotrexate
• Anticoagulants (e.g., Warfarin) — increased bleeding risk
• Corticosteroids — increased risk of GI ulceration
• ACE inhibitors and Angiotensin Receptor Blockers (ARBs) — reduced antihypertensive effect and risk of kidney impairment
• Diuretics — reduced diuretic effect
• Lithium — increased plasma lithium levels
• Cyclosporine and Tacrolimus — increased risk of nephrotoxicity
• SSRIs — increased risk of gastrointestinal bleeding

Always inform your doctor or pharmacist about all medications, supplements, and herbal products you are currently taking.

Like all NSAIDs, Bufen-SR 300 mg can cause side effects, though not everyone experiences them. Common side effects include:

• Headache
• Dizziness and vertigo
• Somnolence (drowsiness)
• Fatigue
• Agitation and irritability
• Insomnia
• Gastrointestinal discomfort or ulcer

Seek immediate medical attention if you experience signs of gastrointestinal bleeding (black stools, vomiting blood), severe allergic reaction (swelling of face/throat, difficulty breathing), or unusual bruising and bleeding.

Pregnancy: During the first and second trimester, Bufen-SR 300 mg should only be used if clearly necessary and under medical supervision. It is contraindicated during the last trimester of pregnancy due to the risk of premature closure of the ductus arteriosus in the fetus and other complications during delivery.

Lactation: Bufen-SR 300 mg is excreted into breast milk in very low concentrations and is generally considered unlikely to adversely affect a breastfed infant. However, breastfeeding mothers should consult a physician before regular or prolonged use.

• Use the lowest effective dose for the shortest duration necessary to control symptoms.
• Use with caution in patients with a history of gastrointestinal disease, asthma, hypertension, or cardiovascular disease.
• Long-term use may increase the risk of heart attack or stroke, especially in patients with existing cardiovascular risk factors.
• Caution is advised in elderly patients, who are more prone to adverse effects of NSAIDs.
• Monitor renal function during prolonged therapy, particularly in patients with pre-existing kidney impairment.
• Avoid concomitant use with alcohol, as it increases the risk of gastrointestinal bleeding.
• Patients with asthma, chronic urticaria, or nasal polyps may experience bronchospasm or allergic reactions.

Symptoms of Bufen-SR 300 mg overdose may include nausea, vomiting, epigastric pain, drowsiness, headache, tinnitus (ringing in the ears), and in severe cases, metabolic acidosis, kidney failure, hypotension, and unconsciousness.

In case of suspected overdose, seek emergency medical attention immediately. Treatment is generally supportive and symptomatic; activated charcoal may be administered if the overdose is recent. There is no specific antidote for Bufen-SR 300 mg overdose.

• Store in a cool, dry place, protected from light, below 30°C.
• Keep out of reach and sight of children.
• Do not use after the expiry date printed on the packaging.

Drugs for Osteoarthritis, Drugs used for Rheumatoid Arthritis, Non-steroidal Anti-inflammatory Drugs (NSAIDs)

Bufen-SR 300 mg has a high level of anti-inflammatory, anti-pyretic, and analgesic activity. The analgesic effects of Bufen-SR 300 mg are due to both a peripheral and a central effect. Bufen-SR 300 mg is a potent inhibitor of the enzyme cyclooxygenase, which thus results in a marked reduction in prostaglandin synthesis. Bufen-SR 300 mg also inhibits the synthesis of some lipo-oxygenase products. Bufen-SR 300 mg thus quickly relieves pain and stiffness, reduces swelling, and improves the movement of different joints of arthritis sufferers.

Adverse effects of Bufen-SR 300 mg on the developing fetus cannot be fully excluded. Bufen-SR 300 mg should not be used during pregnancy and for nursing mothers unless the potential benefits to the mothers outweigh the potential risks.