Do any of the listed medical conditions apply to you?
Significant liver problems (such as cirrhosis of the liver) or kidney problems
Currently prescribed GTN, Isosorbide mononitrate, Isosorbide dinitrate , Nicorandil (nitrates) or Rectogesic ointment
Abnormal blood pressure (lower than 90/50 mmHg or higher than 160/90 mmHg)
Condition affecting your penis (such as Peyronie's Disease, previous injuries or an inability to retract your foreskin)
History of loss of vision in one eye because of damage to the optic nerve (non-arteritic schaemic optic neuropathy) or a hereditary retinal problem such as retinitis pigmentosa
Galactose intolerance, Glucose-galactose malabsorption or Lapp lactase deficiency (this is different to Lactose intolerance)