From the digestive system: more often - constipation; less often - dryness of the oral mucosa, anorexia, nausea, vomiting; rarely - gastralgia, spasms in the gastrointestinal tract, biliary tract spasm,paralytic intestinal obstruction, toxic megacolon (constipation, flatulence, nausea, spasms in the stomach, vomiting); frequency unknown - hepatotoxicity (dark urine, pale stool, icteric sclera and skin).
From the nervous system and sense organs: more often - drowsiness; less often - dizziness, headache, fatigue, nervousness, confusion (hallucinations, depersonalization), blurred vision (including diplopia), in children - paradoxical agitation, anxiety; rare - restless sleep, nightmares, convulsions, depression, at high doses - stiffness of muscles (especially respiratory), tremor, involuntary muscle twitching, frequency unknown - ringing in the ears, impaired coordination of eyeball movements with visual impairment, increased smooth muscle tone at doses above 60 mg).
From the side of the cardiovascular system, less often - arrhythmias (tachy- or bradycardia), lowering blood pressure; frequency unknown - increased blood pressure.
On the part of the respiratory system, less often - atelectasis, oppression of the respiratory center.
From the side of the urinary system, less often - a decrease in diuresis, spasms of ureters (difficulty and pain when urinating, frequent urge to urinate); frequency is unknown - atony of the bladder.
Allergic reactions: less often - skin rash, hives, itching, face swelling, bronchospasm, laryngeal edema, laryngospasm.
Other: less often - sweating, imaginary feeling of well-being, a feeling of discomfort; frequency unknown - weight gain; with prolonged use - drug dependence, withdrawal syndrome.