Gastrointestinal adverse reactions, including nausea and vomiting, were the most common adverse reactions in patients who received active treatment, and occurred at a substantially lower rate in the Prometax 9.5 mg/ 24 h transdermal patch group compared to the Prometax capsule group (7.2% vs 23.1% for nausea and 6.2% vs 17.0% for vomiting; 5.0% and 3.3% of patients on placebo reported nausea and vomiting, respectively).