The following adverse reactions have been observed, but there is not enough data to support an estimate of frequency. Cardiovascular: Tachycardia, palpitation. Allergic: Severe allergic reaction or drug idiosyncrasies including anaphylaxis. CNS: Headaches, nervousness, mental confusion, drowsiness, dizziness. Special Senses: Blurred vision, dilation of the pupil, cycloplegia, increased ocular tension, loss of taste. Renal: Urinary hesitancy and retention. Gastrointestinal: Nausea, vomiting, constipation, bloated feeling. Dermatologic: Decreased sweating, urticaria and other dermal manifestations. Miscellaneous: Xerostomia, weakness, insomnia, impotence, suppression of lactation.