Quinine for muscle cramps.

Area of Science:

• Neurology
• Pharmacology

Background:

• Muscle cramps are common and can have various causes.
• Quinine is a frequently used treatment for muscle cramps, but its effectiveness and safety are debated.

Purpose of the Study:

• To evaluate the efficacy and safety of quinine for treating muscle cramps.

Main Methods:

• Conducted a systematic review of randomized controlled trials (RCTs) up to July 2010.
• Included RCTs involving individuals of all ages experiencing muscle cramps treated with quinine or its derivatives.
• Analyzed data from 23 trials involving 1586 participants.

Main Results:

• Quinine (200-500 mg/day) significantly reduced cramp number (28%), intensity (10%), and cramp days (20%) compared to placebo over two weeks.
• Minor adverse events, primarily gastrointestinal, were slightly more common with quinine (3% difference).
• No significant difference in major adverse events was observed between quinine and placebo, though one case of thrombocytopenia occurred.

Conclusions:

• Moderate-quality evidence supports quinine's efficacy in reducing cramp frequency, intensity, and days at dosages of 200-500 mg/day.
• Moderate-quality evidence indicates that short-term use (up to 60 days) of quinine does not significantly increase serious adverse events compared to placebo.
• Further research is needed on optimal dosage, duration, and alternative treatments for muscle cramps.