Sildenafil
Sildenafil is a phosphodiesterase type V inhibitor used in the treatment of impotence.
Contraindications
Side-effects
Contraindications
- patients taking nitrates and related drugs such as nicorandil
- hypotension
- recent stroke or myocardial infarction (NICE recommend waiting 6 months)
Side-effects
- visual disturbances e.g. blue discolouration, non-arteritic anterior ischaemic neuropathy
- nasal congestion
- flushing
- gastrointestinal side-effects
- headache
The blue pill, Viagra (sildenafil), causes blue discolouration of vision