Diclofenac for Acute Migraine Treatment and Arthritis Pain Relief

Diclofenac is a nonsteroidal anti-inflammatory drug (NSAID) available in oral powder form for acute treatment of migraine attacks in adults and as a topical gel for temporary relief of arthritis pain in certain joints. The oral powder is designed for mixing in water and is used to treat migraines with or without aura. The topical gel is applied to the skin to reduce arthritis pain in hands, wrists, elbows, feet, ankles, and knees.

Diclofenac potassium powder for oral solution: Used for the acute treatment of migraine attacks with or without aura in adults aged 18 years and older. It is not indicated for migraine prevention or for cluster headaches.

Diclofenac sodium topical gel, 1%: Used for the temporary relief of arthritis pain in upper body areas (hand, wrist, elbow) and lower body areas (foot, ankle, knee). It is not effective for strains, sprains, bruises, or sports injuries.

Diclofenac potassium; Diclofenac sodium

Diclofenac works by blocking the production of prostaglandins, chemicals in the body that cause pain, inflammation, and fever. When taken orally as diclofenac potassium powder, it reduces migraine pain by inhibiting these pain-signaling chemicals. When applied topically as diclofenac sodium gel, it penetrates the skin at the application site to relieve joint pain associated with arthritis, with minimal systemic absorption.

Diclofenac potassium powder for oral solution (adults):

• Take a single 50 mg dose by emptying one packet into 1 to 2 ounces (30 to 60 mL) of water, mixing well, and drinking immediately.
• Do not use liquids other than water to mix the powder.
• Taking with food may reduce effectiveness; taking on an empty stomach is preferred.
• Use the lowest effective dose for the shortest time. Safety and effectiveness of repeat dosing have not been established.
• Dosing from other diclofenac formulations is not interchangeable with this oral solution.

Diclofenac sodium topical gel, 1%:

• Apply up to 4 times daily to the affected joint areas.
• Use only on up to 2 body areas at the same time (hand, wrist, elbow, foot, ankle, knee).
• Measure dose with the provided dosing card: 2 grams (2.25 inches on card) for upper body areas; 4 grams (4.5 inches) for lower body areas.
• Apply only to clean, dry skin without cuts, wounds, infections, or rashes.
• Wash hands after application and avoid contact with eyes, nose, or mouth.
• Do not use with external heat sources or bandages over the treated area.
• Maximum duration of use is 21 days unless directed by a doctor.

• Known hypersensitivity to diclofenac or any components of the drug product, including history of anaphylaxis or serious skin reactions.
• History of asthma, urticaria, or allergic-type reactions after taking aspirin or other NSAIDs.
• Use in the setting of coronary artery bypass graft (CABG) surgery.
• Previous serious skin reactions to NSAIDs (for oral solution).

Serious cardiovascular and gastrointestinal risks:

• NSAIDs like diclofenac increase the risk of serious cardiovascular thrombotic events such as myocardial infarction and stroke, which can be fatal. Risk may begin early and increase with longer use.
• Diclofenac potassium oral solution is contraindicated in patients undergoing coronary artery bypass graft (CABG) surgery.
• Serious gastrointestinal adverse events, including bleeding, ulceration, and perforation, may occur without warning. Elderly patients and those with a history of GI bleeding or ulcers are at higher risk.

Other important warnings and precautions:

• Hepatotoxicity: Monitor liver function tests. Discontinue if liver injury is suspected.
• Hypertension: May reduce effects of antihypertensive drugs; monitor blood pressure closely.
• Heart failure: Avoid in severe heart failure unless benefits outweigh risks.
• Renal toxicity: Monitor kidney function, especially in patients with dehydration, renal or hepatic impairment, or heart failure.
• Anaphylaxis and allergic reactions: Contraindicated in patients with aspirin-sensitive asthma; seek emergency help if anaphylaxis occurs.
• Serious skin reactions, including Stevens-Johnson Syndrome, may occur; discontinue if symptoms appear.
• Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS) has been reported; discontinue if suspected.
• Medication overuse headache: Overuse of migraine treatments including NSAIDs may worsen headache frequency.
• Pregnancy: Avoid use after about 20 weeks gestation due to fetal risks including kidney problems and premature closure of the ductus arteriosus after about 30 weeks.
• Increased risk of bleeding, particularly when combined with anticoagulants or drugs affecting platelet function.

Common:

• Nausea (about 3%)
• Dizziness (about 1%)

Less common and postmarketing reactions:

• Gastrointestinal: Abdominal pain, constipation, diarrhea, dyspepsia, flatulence, ulcers, bleeding, vomiting
• Renal: Abnormal renal function
• Hematologic: Anemia, increased bleeding time
• Central nervous system: Headache, dizziness, insomnia, somnolence, tremors
• Skin: Rash, pruritus, photosensitivity, exfoliative dermatitis, Stevens-Johnson syndrome, toxic epidermal necrolysis, urticaria
• Hypersensitivity: Anaphylaxis, angioedema

Drugs that increase bleeding risk:

• Anticoagulants (e.g., warfarin), antiplatelet agents (e.g., aspirin), SSRIs, SNRIs increase risk of serious bleeding with diclofenac; monitor for signs of bleeding.

Aspirin:

• Use with aspirin may increase gastrointestinal adverse reactions without increased therapeutic effect; generally not recommended.

Antihypertensives:

• NSAIDs may reduce efficacy of ACE inhibitors, angiotensin receptor blockers, and beta blockers; monitor blood pressure.
• Risk of worsening renal function when combined with ACE inhibitors or ARBs, especially in elderly or volume-depleted patients.

Diuretics:

• NSAIDs can reduce effectiveness of loop and thiazide diuretics; monitor renal function and diuretic effect.

Digoxin:

• May increase digoxin serum concentrations; monitor levels.

Lithium:

• May increase lithium levels; monitor for lithium toxicity.

Methotrexate:

• May increase methotrexate toxicity; monitor patients closely.

Cyclosporine:

• May increase nephrotoxicity; monitor renal function.

Other NSAIDs and salicylates:

• Concomitant use increases GI toxicity risk with little added benefit; not recommended.

Pregnancy:

• Avoid diclofenac use from about 20 weeks gestation onwards due to risk of fetal kidney problems (oligohydramnios) and potential neonatal renal impairment.
• Avoid use at about 30 weeks gestation and later due to risk of premature closure of the fetal ductus arteriosus and other fetal harms.

Breastfeeding:

No specific information provided on use during breastfeeding.

The source does not provide specific details on overdose symptoms or management for diclofenac.

Diclofenac sodium topical gel, 1% should be stored at 20-25°C (68-77°F) and protected from freezing. Store the dosing card with the gel and keep out of reach of children.

Storage information for diclofenac potassium oral powder for solution is not explicitly provided in the source.