Sildenafil safety information
The following safety information is intended to help you take sildenafil as safely and effectively as possible. Please read it before taking sildenafil to ensure it is safe for you to take.
How sildenafil works
Sildenafil works by helping to relax and open up the blood vessels in your penis, allowing for increased blood flow. This means that when you are sexually aroused, you can achieve a harder and longer-lasting erection.
Don’t take sildenafil if:
You have had an allergic reaction to sildenafil or any similar medications in the past.
You have low blood pressure.
You are taking medications that contain nitrates (usually for chest pain).
You are using amyl nitrites (“poppers”).
You have recently had a heart attack or a stroke.
You have a serious heart or liver condition.
You have a history of non-arteritic anterior ischaemic optic neuropathy (NAION).
You have an inherited condition affecting your retinas, such as retinitis pigmentosa.
Sildenafil may not be suitable for you if you:
Have a deformity of your penis, such as Peyronie’s disease.
Have stomach ulcers.
Have a bleeding disorder, such as haemophilia.
Have a heart condition, including left ventricular outflow obstruction.
Have sickle cell anaemia, leukaemia or multiple myeloma.
Sildenafil should only be used by men over the age of 18 who have erectile dysfunction. It should not be used with other treatments for erectile dysfunction. If you aren’t sure whether you have any of the conditions listed above, please consult your doctor.
What to expect
Taking sildenafil doesn’t result in an instantaneous erection - a little bit of planning is required. Sildenafil starts working an hour after you take it, and the effects last for four to five hours. This means that there’s a window of about three hours when you can plan to have sex - and you’ll need to be sexually aroused for sildenafil to take effect. Your resulting erection should feel harder and last longer than before. Eating a large meal at the same time as taking sildenafil can delay the effects by about an hour.
Recommended starting dose
The recommended starting dose for sildenafil is 50mg taken once per day, as needed. A clinician will review your online consultation and determine if this is appropriate for you. If you feel the effect of sildenafil is too strong or too weak, feel free to contact us and we can advise you on adjusting your dosage.
You should not take more than one dose of sildenafil within 24 hours.
It’s worth noting that sildenafil doesn’t alter libido or sexual desire. It also doesn’t have an effect on your testosterone levels.
Possible side effects of sildenafil
If you experience any of the following serious (but uncommon) side effects, you should stop taking sildenafil and seek urgent medical attention:
An allergic reaction - symptoms include swelling of the lips, throat and eyelids, sudden difficulty in breathing or wheezing, dizziness, collapse.
Chest pains - you should not use nitrate-containing medication to treat this.
A prolonged erection lasting more than four hours, which may be painful - this is a medical emergency and you should visit A&E as soon as possible.
Severe skin reactions - swelling, blistering or peeling skin.
Seizures.
Always read the Patient Information Leaflet enclosed with your sildenafil. It contains other important safety information as well as a complete list of possible side effects.