From the cardiovascular system: less often - angina, bradycardia or tachycardia, palpitation, increase or decrease in blood pressure, at high doses - ventricular arrhythmias; rarely - arrhythmia, pain in the chest.
From the nervous system: more often - headache, anxiety, tremor; less often - dizziness, nervousness, fatigue, psychoneurotic disorders (psychomotor agitation, disorientation, memory impairment, aggressive or panic behavior, schizophreniform disorders, paranoia), sleep disturbance, muscle twitching.
From the digestive system: more often - nausea, vomiting.
From the side of the urinary system: rarely - labored and painful urination (with prostatic hyperplasia).
Allergic reactions: angioedema, bronchospasm, skin rash, erythema multiforme.
Other: rarely - hypokalemia; less frequent - increased sweating