In therapeutic doses, the drug is usually well tolerated. Sometimes allergic reactions are possible (skin rash, itching, very rarely anaphylactic shock).In rare cases - a burning sensation in the epigastric region, dry mouth, headache. Possible - dizziness, lower blood pressure, tachycardia, cyanosis. With long-term admission - cases of violation of the blood system (thrombocytopenia, leukopenia, agranulocytosis). With propensity to bronchospasm may provoke an attack. In very rare cases - malignant exudative erythema (Stevens-Johnson syndrome), toxic epidermal necrolysis (Lyell's syndrome), decreased sweating, accommodation paresis, urinary retention. Rarely (usually with prolonged administration or administration of high doses) - a violation of kidney function: oliguria, anuria, proteinuria, interstitial nephritis, staining the urine in red.
All side effects should be reported to your doctor.