Dr. I-Net

Erectile dysfunction - Viagra and other similar medications:

The erectile dysfunction is treatable now, by a class of drugs called phosphodiesterase-5 (PDE-5) inhibitors. The medications - sildenafil (Viagra), vardenafil (Levitra) and tadalafil (Cialis) - all improve erectile function in the same basic way, but they differ in how fast they take effect to last.

Viagra, Levitra and Cialis - How they work:

Viagra, Levitra and Cialis prevent the breakdown of nitric oxide, a chemical messenger that promotes relaxation and opening of the blood vessels that supply erectile tissue in the penis. Under the influence of nitric oxide, these vessels expand and stay dilated. Increased flow of blood makes erectile tissue swell and compress the veins that carry blood out of the penis, resulting in a full erection.

PDE-5 inhibitors do not automatically trigger erections. Sexual stimulation also is needed to start the whole process. The medications enable a more complete response to sexual stimulation.

Many clinical trials have shown that PDE-5 inhibitors improve erectile function regardless of the underlying cause or causes. Viagra, Levitra and Cialis increase the number and quality of erections and sexual experiences in men with erectile dysfunction due to arteriosclerosis, diabetes, spinal cord injury, depression or the aftereffects of prostate cancer surgery.

Similarities and differences

These drugs has different chemical compositions and affect men of different ages or with different medical conditions - aren't known. No study has directly compared these three medications. You can take them with or Without food, 30 to 60 minutes before sexual activity. Effects last from four hours up to 24 hours.

Side effects

Headache, flushing, indigestion, stuffy or runny nose, upset stomach, diarrhea Headache, flushing, indigestion, stuffy or runny nose, upset stomach, dizziness Headache, indigestion, back pain, muscle aches, flushing, stuffy or runny nose.

Warnings

Do not take with nitrates (Nitro-Dur, others), or if you have certain heart valve problems. Should be used with caution or not used at all with alpha blockers. Should not be used with some antibiotic, antiviral or antifungal medications. Do not take with nitrates (Nitro-Dur, others) or alpha blockers (Hytrin, Cardura, others), or if you have certain heart valve problems. Should be used with caution or not used at all with alpha blockers. Should not be used with some antibiotic, antiviral or antifungal medications. Do not take with nitrates (Nitro-Dur, others) or alpha blockers (Hytrin, Cardura, others), or if you have certain heart valve problems. Should be used with caution or not used at all with alpha blockers. Should not be used with some antibiotic, antiviral or antifungal medications.

Several factors may affect your choice of medication, including how well your body responds to one drug over another and how long you want the effects of each dose to last. Talk to your doctor about your options and personal preferences to help decide which one of these medications might work for you.

These medicines are Not safe for everyone

Although these medications can help many people, not all men can safely take them. PDE-5 inhibitors may worsen certain medical conditions and interact with a number of drugs. Erectile dysfunction medications are dangerous when used with nitrate medications, such as nitroglycerin (Nitro-Dur, others), often prescribed to prevent or treat acute angina (chest pain due to coronary artery disease). Both types of medication dilate blood vessels, and their combined effects can cause dizziness, low blood pressure and loss of consciousness.

In rare cases, men using PDE-5 inhibitors have suffered permanent, total vision loss due to nonarteritic anterior ischemic optic neuropathy (NAION). Because NAION and erectile dysfunction share many of the same risk factors, it's unclear whether the drug or an underlying condition is responsible. If you're considering an erectile dysfunction drug but have a retinal disorder, such as diabetic retinopathy, see your eye doctor first.

Realistic expectations

Occasional erectile dysfunction is a common problem, particularly as men age. Medication won't make you feel like you're 20 again, but it can help you achieve satisfying sexual relations more often. Be willing to work with your doctor to find which medication and dosage is best for you.