From the side gastrointestinal tract: constipation, nausea, vomiting, dry mouth, anorexia, spasm of bile ducts; with inflammatory bowel diseases - paralytic intestinal obstruction and toxic megacolon; jaundice.
From the side nervous system and sense organs: dizziness, headache, blurred vision, diplopia, tremor, involuntary muscle contraction, convulsions, weakness, drowsiness, confusion, disorientation, euphoria, nightmarish or unusual dreams, hallucinations, depression, paradoxical agitation, restlessness, rigidity of muscles (especially respiratory) , ringing in the ears, slowing the speed of psychomotor reactions.
From the side respiratory system: depression of the respiratory center.
From the side of cardio-vascular system: decrease or increase of arterial pressure, arrhythmia.
From the side urinary system: decreased urine output, urine retention.
Allergic reactions: bronchospasm, laryngospasm, angioedema, skin rash, skin itch, face swelling.
Local reactions: hyperemia, edema, "burning" at the injection site.
Other: increased sweating, addiction, drug dependence.