Allergic reactions to sulfa medications, also called sulfonamides, are a common occurrence. Read more about the symptoms and medications to avoid. Zofran is a brand name for the drug ondansetron, prescribed to treat or prevent nausea and vomiting. Doctors sometimes prescribe Zofran to treat nausea and vomiting. Note: This page contains information about the side effects of bisacodyl. Some of the dosage forms included on this document may not apply to the brand name Dulcolax. How should I take AcipHex? AcipHex is usually taken once per day. Follow all directions on your prescription label. Do not take this medicine in larger or smaller.