1. In the last 6 months, have you had a heart attack or a stroke?*
2. Do you feel very breathless or get chest pain with light to moderate exercise such as walking fast for 20 minutes or climbing 2 flights of stairs?*
3. Are you taking any of these medicines or drugs?*
4. Do you have any of the following health conditions?*
  1. Liver or kidney disease
  2. Blood diseases: leukaemia, sickle cell anaemia, multiple myeloma
  3. Bleeding issues: haemophilia or stomach ulcers
  4. A heart problem, uncontrolled high blood pressure, low blood pressure, unstable angina or heart failure
5. Do you have Peyronie’s disease or any other deformation of the penis?*
6. Have you ever had loss of vision because of damage to the optic nerve (known as NAION) or have an inherited eye disease (e.g. retinitis pigmentosa)?*
7. Do you have any allergies or intolerances (e.g. lactose intolerance)*