Indications
This combination is indicated for treatment of the signs and symptoms of osteoarthritis or rheumatoid arthritis in patients at high risk of developing NSAID-induced gastric and duodenal ulcers and their complications.
Therapeutic Class
Drugs for Osteoarthritis, Drugs used for Rheumatoid Arthritis, Non-steroidal Anti-inflammatory Drugs (NSAIDs)
Pharmacology
Diclofenac, a phenylacetic acid derivative is a prototypical NSAID. It has potent anti-inflammatory, analgesic and antipyretic actions. It reversibly inhibits the enzyme, cyclooxygenase, thus resulting in reduced synthesis of prostaglandin precursors.Misoprostol is a synthetic prostaglandin E1 analogue. It protects the GI mucosa by inhibiting basal, stimulated and nocturnal acid secretion and by reducing the volume of gastric secretions and increasing bicarbonate and mucus secretion. It also induces contractions of smooth muscle fibres of the myometrium and relaxation of the cervix uteri.
Dosage & Administration
Osteoarthritis: The recommended dosage for maximal GI mucosal protection is Diclofenac Sodium 50 mg & Misoprostol 200 µg tid. For patients who experience intolerance, Diclofenac Sodium 75 mg & Misoprostol 200 µg bid or Diclofenac Sodium 50 mg p& Misoprostol 200 µg bid can be used.Rheumatoid arthritis: The recommended dosage is Diclofenac Sodium 50 mg & Misoprostol 200 µg tid or qid. For patients who experience intolerance, Diclofenac Sodium 75 mg & Misoprostol 200 µg bid or Diclofenac Sodium 50 mg & Misoprostol 200 µg bid can be used.
Interaction
Aspirin:Â Concomitant administration with aspirin is not recommended because Diclofenac Sodium is displaced from its binding sites by aspirin, resulting in lower plasma concentrations, peak plasma levels and AUC values.Digoxin:Â Elevated digoxin levels have been reported in patients receiving digoxin and Diclofenac Sodium. Antihypertensives: NSAIDs can inhibit the activity of antihypertensives, including ACE inhibitors.
Warfarin: The effects of warfarin and NSAIDs on GI bleeding are synergistic, such that users of both drugs together have a risk of serious bleeding greater than users of either drug alone.
Oral hypoglycaemics: Diclofenac Sodium does not alter glucose metabolism in healthy people nor it alters the effects of oral hypoglycaemics. Diclofenac Sodium may alter diabetic patient’s response to insulin or oral hypoglycaemics.
Warfarin: The effects of warfarin and NSAIDs on GI bleeding are synergistic, such that users of both drugs together have a risk of serious bleeding greater than users of either drug alone.
Oral hypoglycaemics: Diclofenac Sodium does not alter glucose metabolism in healthy people nor it alters the effects of oral hypoglycaemics. Diclofenac Sodium may alter diabetic patient’s response to insulin or oral hypoglycaemics.
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