Central and peripheral nervous system: dizziness, sleep disorders, with prolonged use possible development of depression.
Respiratory system: bronchospasm.
Hemopoietic system: thrombocytopenia, leukopenia, agranulocytosis.
The cardiovascular system: arterial hypotension, bradycardia, Raynaud's syndrome.
Digestive system: indigestion, diarrhea, or constipation.
Musculoskeletal system: arthralgia, back pain, cramps calf muscles.
Dermatological reactions: a rash, hives.
Sense organs: "dry eye syndrome", transient visual impairment.
Reproductive system: decreased potency, weakened libido.
Allergic reactions.