Erectile Dysfunction Health Point


Phosphodiesterase-5 inhibitors (PDE-5 inhibitors) are taken before you plan to be sexually active. PDE-5 inhibitors will result in an erection only if you are sexually stimulated.

How It Works

During an erection, blood fills tissue in the penis, causing it to enlarge and become stiff. The PDE-5 inhibitors relax smooth muscle, allowing the penis to fill with blood.
Why It Is Used

PDE-5 inhibitors can be used when an erection problem (erectile dysfunction) is caused by:

High blood pressure.
Spinal cord injury or other problems affecting nerve function.
Prostate surgery.
Side effects of medicines.
Emotional or psychological causes.

PDE-5 inhibitors are also used in men who have an enlarged prostate, or benign prostatic hyperplasia (BPH), to help with symptoms.
How Well It Works

All PDE-5 inhibitors are very effective in treating erection problems, no matter what is causing the erection problem.1

How well the PDE-5 inhibitors work depends on the person taking it and how much he takes. But these medicines seem to work in about 7 out of 10 men who use them for erection problems.2

The medicine needs to be taken before you plan to have sex:

Sildenafil starts to work as soon as 30 minutes and up to 4 hours after you take a pill.
Vardenafil starts to work as soon as 30 minutes and up to 4 hours after you take a pill.
Tadalafil starts to work as soon as 20 minutes and up to 36 hours after you take a pill.

PDE-5 inhibitors, such as tadalafil, may help reduce BPH symptoms in men (whether or not they have erection problems). Men have about a 5-point reduction in their symptom scores on the American Urological Association symptom index.3
Side Effects

All medicines have side effects. But many people don’t feel the side effects, or they are able to deal with them. Ask your pharmacist about the side effects of each medicine you take. Side effects are also listed in the information that comes with your medicine.

Here are some important things to think about:

Usually the benefits of the medicine are more important than any minor side effects.
Side effects may go away after you take the medicine for a while.
If side effects still bother you and you wonder if you should keep taking the medicine, call your doctor. He or she may be able to lower your dose or change your medicine. Do not suddenly quit taking your medicine unless your doctor tells you to.

Emergency services right away if you have:

Trouble breathing.
Swelling of your face, lips, tongue, or throat.

Call your doctor right away if you have:

An erection that lasts longer than 3 hours or is painful.
A sudden loss of vision in one or both eyes. Stop taking the medicine.
A sudden loss of hearing in one or both ears. Stop taking the medicine.
Changes in your heartbeat (such as beating too fast or too slow).
Other vision changes, such as blurred vision, a change in how you see colors, or increased sensitivity to light.
A new diagnosis of a heart problem. This medicine can cause serious side effects in people who have heart problems.

Common side effects of this medicine include:

Acid reflux, heartburn, indigestion, or burping.
A bloody nose.
Flushing or unusually warm skin.
Muscle aches or pains.
A stuffy nose, runny nose, or sneezing.

See Drug Reference for a full list of side effects. (Drug Reference is not available in all systems.)
What To Think About

Do not take PDE-5 inhibitors if you are taking any medicine that contains nitrates, such as nitroglycerin. This combination can lower blood pressure dangerously, possibly leading to a stroke, a heart attack, or death. If you are taking a medicine called an alpha-blocker—used to treat high blood pressure or an enlarged prostate—check with your doctor before you take a PDE-5 medicine.

It is important that you tell all of your health care providers that you take this medicine. If you need emergency medical care for a heart problem, your health care provider will need to know when you last took this medicine..

These medicines may be linked to a rare type of vision loss. If you already have eye disease or vision problems (such as cataracts, glaucoma, or retinopathy), be sure to talk with your eye doctor (ophthalmologist) before you start taking any PDE-5 inhibitors.

Do not drink alcohol to excess (for example, 5 glasses of wine or 5 shots of whiskey) when you are taking tadalafil. Large amounts of alcohol can increase your chances of getting a headache or feeling dizzy, increasing your heart rate, or lowering your blood pressure.

Talk with your doctor about whether medicines for erection problems are safe for you if you:

Have heart disease.
Have heart failure or low blood pressure.
Are taking drugs for high blood pressure.

Sexual activity is exercise. If you have a heart condition and have not been sexually active for a while, talk with your doctor to make sure you can safely engage in sexual activity.

If you eat a high-fat meal around the time you take sildenafil or vardenafil, the medicine does not work as well as it otherwise would. So many doctors recommend you take this medicine on an empty stomach. Tadalafil works without regard to what you eat.

If you are thinking about taking PDE-5 inhibitors for erection problems, it is important to include your partner in your discussions.

PDE-5 inhibitors can be prescribed by any doctor. You do not have to see a doctor who specializes in sexual health. PDE-5 inhibitors are also available on the Internet. If you obtain the medicine through this route, you should discuss its use with your doctor.

PDE-5 inhibitors may affect fertility. If you are trying to have a child, you may want to ask your doctor about how this medicine can affect your chances of conceiving.
Taking medicine

Medicine is one of the many tools your doctor has to treat a health problem. Taking medicine as your doctor suggests will improve your health and may prevent future problems. If you don’t take your medicines properly, you may be putting your health (and perhaps your life) at risk.

There are many reasons why people have trouble taking their medicine. But in most cases, there is something you can do. For suggestions on how to work around common problems, see the topic Taking Medicines as Prescribed.

Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor if you are having problems. It’s also a good idea to know your test results and keep a list of the medicines you take.


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