Predisposing factors of urinary retention eg, spinal cord lesion, prostatic hyperplasia; epilepsy or at risk of convulsions. Perform allergy skin test 3 days after treatment. Avoid alcohol consumption. Avoid abrupt w/drawal. May affect ability to drive or operate machinery. Hepatic & renal impairment. Pregnancy & lactation. Tab: Not recommended in childn <6 yr.