Call your doctor right away if you have serious side effects. Call 911 if your symptoms feel life-threatening or if you think you’re having a medical emergency. Serious side effects and their symptoms can include the following:
Low blood pressure. Symptoms can include:
* blurry vision
* nausea or vomiting
Increased shortness of breath or trouble breathing
Priapism (an erection that won’t go away). Symptoms can include:
* an erection that lasts more than 4 hours
Vision problems. Symptoms can include:
* sudden vision loss in one or both eyes
Hearing problems. Symptoms can include:
* sudden hearing loss
* tinnitus (ringing in your ears)
Heart problems, such as heart attack, stroke, or irregular heart rate. Symptoms can include:
* chest pain
* shortness of breath
* trouble speaking
* nausea or vomiting
* feeling lightheaded
Disclaimer: Our goal is to provide you with the most relevant and current information. However, this information does not contain all possible side effects. Also, rates observed in the clinical trials of a drug may not reflect the rates observed in practice, and each person may respond to drugs differently. This information is not a substitute for medical advice. Always discuss possible side effects with a healthcare provider who knows your medical history.
Priapism warning: This drug can cause priapism, which is an erection that won’t go away. If you have an erection that lasts more than 4 hours, call 911 or go to the nearest emergency room. If it’s not treated right away, this condition can cause permanent damage to your penis.
Sudden vision loss warning: This drug can cause sudden vision loss in one or both eyes. This can be a sign of a serious eye problem. If this occurs, stop taking sildenafil and call your doctor right away.
Sudden hearing loss warning: This drug can cause hearing loss, tinnitus (ringing in your ears), or dizziness. If you have sudden hearing loss with or without tinnitus or dizziness, stop taking sildenafil and call your doctor right away.
Use in children warning: Children with PAH who take this drug may be at increased risk of death. Children should not take sildenafil.