ADVERSE REACTIONS Nystatin is well tolerated even with prolonged therapy. Oral irritation and sensitization have been reported. (See PRECAUTIONS: General ). Gastrointestinal : Diarrhea (including one case of bloody diarrhea), nausea, vomiting, gastrointestinal upset/disturbances. Dermatologic : Rash, including urticaria has been reported rarely. Stevens-Johnson syndrome has been reported very rarely. Other : Tachycardia, bronchospasm, facial swelling, and nonspecific myalgia have also been rarely reported. To report SUSPECTED ADVERSE REACTIONS, contact VistaPharm, LLC, at 1-888-655-1505 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.