Some drugs for treatment of migraine attacks are listed in table 2 on page 18. Drugs for prevention of migraine are listed in table 3 on page 20. Treatment of migraine in the emergency room, which may involve use of intravenous drugs, is not included here.

Since the publication of our article on colonoscopy preparations,1 which compared polyethylene glycol electrolyte solutions (GoLytely, and others) with sodium phosphate (Fleet Phospho-Soda, and others), some readers have told us that we should have included a combination of a magnesium citrate solution with bisacodyl tablets (Evac-QKwik, and others) as an alternative. In one study, such a preparation offered better cleansing and patient tolerance than a sodium phosphate regimen.2

1. Colonoscopy preparations. Med Lett Drugs Ther 2005; 47:53.

2. M Delegge and R Kaplan. Efficacy of bowel preparation with the use of a prepackaged, low fibre diet with a low sodium, magnesium citrate cathartic vs. a clear liquid diet with a standard sodium phosphate cathartic. Aliment Pharmacol Ther 2005; 21:1491.