Like all medicines, this medicine can cause side effects, although not everybody gets them.
Seek immediate medical help if you have any of the following symptoms:
• An erection that lasts for more than 4 hours
• Serious allergic reactions which causes difficulty in breathing or dizziness
• Skin reactions such as rashes and blistering.
Very common: may affect more than 1 in 10 people
• Pain in the penis
Common: may affect up to 1 in 10 people
• Burning sensation during injection which quickly gets better
• Pain at the site of injection
• Lumps at the site of injection or in your penis after long-term use.
• Spot-like bruising (blood spots under the skin) at the site of injection
• Fluttering or vibrating feeling sensation due to uncontrollable muscle movement
• Erections might occur more often and longer in duration
• Bend or kink in the penis, especially after long-term use
Uncommon: may affect up to 1 in 100 people
• Reddening, itching, swelling, blistering, numbness, tenderness or a feeling of warmth
at the site of injection
• Bleeding at the site of injection
• Headache
• Priapism (prolonged erection of more than 4 hours)
• Fungal infection
• Common cold
• Reduced sense of touch or sensation
• Heightened sense of touch or sensation
• Dilation of the pupils
• Changes to heart rhythm or increased heart rate
• Low blood pressure
• Raised creatinine
• Decreased or altered blood flow to the arms or legs
• Feeling sick
• Dry mouth
• Skin rash
• Excessive sweating
• Pain when urinating, urinating more frequently or a sudden need to urinate
• Bleeding in the urethra, which can cause there to be blood in your urine
• A general increase in iron stores in the body
• Problems attaining or maintaining an erection
• Problems with ejaculation
• Painful or swollen testicles
• Lumps on the testicles
• Pain in the pelvis
• Pain, swelling or reddening of the scrotum
• Pain, swelling or reddening at the tip of the penis
Rare: may affect up to 1 in 1,000 people
• Serious allergic reactions which causes difficulty in breathing or dizziness
• Skin reactions such as rashes and blistering
• Drop in blood pressure, which may cause dizziness or fainting
• Scarring of the inside of the penis after long-term use.
• Rare nervous system disorders like vertigo (disorientation with spinning sensation),
dizziness
If any of the side effects gets serious, or if you notice any side effects not listed in this leaflet,
please tell your doctor or pharmacist.
Very rare: may affect up to 1 in 10,000 people
• Isolated cases of thrombocytopenia (abnormal drop in the number of platelets)
Not known: frequency cannot be estimated from the available data
• Loss of memory
• Stroke
• Insufficient blood flow to the heart muscle via the coronary arteries, often resulting in
chest pain (angina pectoris); heart attack
• Bleeding of the stomach and intestines
Reporting of side effects
If you get any side effects, talk to your doctor or pharmacist. This includes any possible side
effects not listed in this leaflet. You can also report side effects directly via:
Yellow Card Scheme
Website: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or
Apple App Store
By reporting side effects, you can help provide more information on the safety of this
medicine.