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The most common side effects are headache, flushing and dyspepsia. Other side effects include visual disturbances, dizziness, nasal congestion, diarrhoea, vomiting, swelling of the eyelids, pain and redness of the eyes, epistaxis, muscle pain, back pain, skin rashes, urinary-tract infection, syncope, cerebrovascular haemorrhage, and transient ischaemic attack. It may also cause priapism, palpitations and serious cardiovascular events including sudden cardiac death. The following adverse reactions were reported during post-marketing surveillance: Immune system disorders: hypersensitivity reaction (including skin rash).
Nervous system disorders: seizure, seizure recurrence.
Cardiac disorders: tachycardia.
Vascular disorders: hypotension, syncope, epistaxis.
Gastrointestinal disorders: vomiting.
Eye disorders: eye pain, red eyes/bloodshot eyes.
Reproductive system and breast disorders: prolonged erection and/or priapism.
