Buy Diclofenac

Diclofenac

Diclofenac: Pain Relief Pill Overview

Diclofenac Sodium is the active ingredient in the medication marketed as Diclofenac. It belongs to the non-steroidal anti-inflammatory drug (NSA NSAID) class and is available in tablet form in strengths of 50 mg and 100 mg. In Hong Kong, Diclofenac is a prescription-only medication regulated by the Pharmacy and Poisons Board under the Department of Health.

How Diclofenac Works in the Body

Diclofenac inhibits the cyclooxygenase (COX) enzymes - COX-1 and COX-2 - which are essential for the conversion of arachidonic acid into prostaglandins. Prostaglandins mediate inflammation, pain, and fever. By reducing prostaglandin synthesis, Diclofenac lowers the inflammatory response, alleviates pain, and can modestly reduce fever. The drug is absorbed rapidly after oral ingestion, reaching peak plasma concentrations within 1-2 hours. Its half-life ranges from 1 to 2 hours, but the anti-inflammatory effect lasts longer due to tissue binding.

Conditions Treated by Diclofenac

Diclofenac is approved in Hong Kong for the following indications:

• Mild to moderate acute pain (e.g., post-operative pain, dental pain, musculoskeletal sprains)
• Chronic inflammatory musculoskeletal conditions such as osteoarthritis and rheumatoid arthritis
• Ankylosing spondylitis (when other NSAIDs are insufficient)
• Dysmenorrhea (painful menstrual cramps)

These uses are supported by the Hong Kong Department of Health’s product monographs and align with international regulatory approvals.

Patient Suitability and Contraindications

Who Should Use Diclofenac?

• Adults with acute or chronic pain conditions listed above
• Individuals without a history of peptic ulcer disease or severe cardiovascular disease
• Patients with normal renal and hepatic function, unless dose adjustments are made

Absolute Contraindications

• Known hypersensitivity to Diclofenac, other NSAIDs, or any tablet excipients
• Active or history of gastrointestinal bleeding or perforation
• Severe heart failure (NYHA Class III-IV) or recent myocardial infarction
• Third-trimester pregnancy (Category X)

Relative Contraindications

• Mild to moderate renal impairment (dose may need reduction)
• Mild to moderate hepatic impairment (monitor liver enzymes)
• Asthma that is exacerbated by aspirin or NSAIDs
• Elderly patients (> 65 years) due to increased risk of renal and gastrointestinal adverse events

Special Populations

• Pregnancy: Use is discouraged in the first and second trimesters unless benefits outweigh risks; contraindicated in the third trimester.
• Lactation: Small amounts pass into breast milk; consult a healthcare professional before use.
• Elderly: Start with the lowest effective dose and monitor for renal and gastrointestinal effects.

Safety Profile: Side Effects and Interactions

Common Side Effects

• Gastrointestinal discomfort (e.g., dyspepsia, nausea) - commonly reported
• Headache - usually mild and transient
• Dizziness - may affect balance in some patients
• Elevated blood pressure - monitor if pre-existing hypertension

Serious Adverse Events

• Gastrointestinal ulceration or bleeding - seek immediate medical attention if black stools or vomiting blood occur
• Cardiovascular events (e.g., myocardial infarction, stroke) - higher risk with long-term high-dose use
• Severe skin reactions (e.g., Stevens-Johnson syndrome) - rare but requires urgent care
• Hepatotoxicity - indicated by jaundice, dark urine, or elevated liver enzymes

Drug Interactions

• Major: Concurrent use with other NSAIDs, anticoagulants (warfarin), or antiplatelet agents (clopidogrel) can markedly increase bleeding risk.
• Moderate: ACE inhibitors, diuretics, and lithium may have altered plasma levels; monitoring is advised.
• CYP Interactions: Diclofenac is metabolized primarily by CYP2C9; inhibitors (e.g., fluconazole) may raise Diclofenac concentrations, while inducers (e.g., rifampin) may reduce efficacy.

Food and Lifestyle Interactions

• Take tablets with food or a full glass of water to minimize gastric irritation.
• Alcohol can increase gastrointestinal bleeding risk; limit intake while on Diclofenac.
• No specific restrictions on driving, but dizziness may impair performance; avoid operating machinery if affected.

Dosing and Administration Guidelines

• Standard dosing: Start with one 50 mg tablet 2-3 times daily. If pain control is inadequate and the patient tolerates the medication, the dose may be increased to one 100 mg tablet 2-3 times daily.
• Maximum daily dose: Do not exceed 150 mg per day (e.g., three 50 mg tablets or one 100 mg tablet plus one 50 mg tablet).
• Renal impairment: Reduce dose by 50 % for patients with moderate renal dysfunction (eGFR 30-59 mL/min/1.73 m²); avoid use if eGFR < 30 mL/min/1.73 m² unless specifically directed by a specialist.
• Hepatic impairment: Use the lowest effective dose and monitor liver function tests periodically.
• Elderly: Begin with 50 mg once or twice daily; increase only if necessary and tolerated.
• Administration: Swallow tablets whole; do not crush or chew.
• Missed dose: Take the missed dose as soon as remembered unless the next scheduled dose is within 4 hours; do not double the dose.
• Overdose: Symptoms may include nausea, vomiting, abdominal pain, and dizziness. Seek emergency medical care; activated charcoal may be considered if presentation is early. No specific antidote exists.
• Discontinuation: For short-term use, stop abruptly. For long-term therapy, tapering is not usually required, but monitor for rebound pain or inflammation.

Monitoring and Follow-Up

• Renal function: Serum creatinine and estimated glomerular filtration rate every 3-6 months for chronic users.
• Liver function: ALT, AST, and bilirubin at baseline and periodically during prolonged therapy.
• Blood pressure: Check at each visit; adjust antihypertensive therapy if needed.
• Gastrointestinal health: Assess for dyspepsia or signs of bleeding; consider gastroprotective agents (e.g., proton-pump inhibitors) in high-risk patients.

Storage and Handling

• Store tablets at room temperature (15-30 °C) in a dry place away from direct sunlight and moisture.
• Keep the container tightly closed and out of reach of children.
• Do not use tablets after the expiration date printed on the packaging.
• Dispose of unused medication according to local pharmacy return programs or household hazardous waste guidelines.

Medication-Specific Glossary

Cyclooxygenase (COX)

An enzyme family (COX-1 and COX-2) that catalyzes the formation of prostaglandins from arachidonic acid, driving inflammation and pain.

Non-steroidal Anti-inflammatory Drug (NSAID)

A class of medications that reduce inflammation, pain, and fever by inhibiting COX enzymes; includes ibuprofen, naproxen, and diclofenac.

Prostaglandin

Lipid compounds that act locally to promote inflammation, pain signaling, and fever; their production is blocked by NSAIDs.

Medical Disclaimer

This article provides educational information about Diclofenac and is not a substitute for professional medical advice. Treatment decisions, including use for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.