Levitra, it’s active substance Vardenafil, is used to combat the effects of erectile dysfunction. This includes producing and mantaining an erection. Blood flow to the penis is increased during sex. A chemical called PDE5 (phosphodiesterase type 5 ) causes an erection to decrease or fail completely, but Levitra reverses this process by blocking the chemical. This does not mean a man can obtain an erection without first becoming aroused, only that if taken roughly an hour before arousal occurs, the penis will remain erect longer. Continue reading Levitra – Vardenafil
Viagra, Levitra and Cialis are often the first treatment tried for erectile dysfunction — the inability to achieve or sustain an adequate erection for sexual activity. For most men with erectile problems, they work well and have few side effects. All three medications improve erectile function in the same basic way, but the effects of tadalafil (Cialis) last longer. This and a few other minor differences among these medications may make one a better choice over another for some men.
Viagra, Levitra and Cialis increase levels of nitric oxide, a chemical produced by your body during sexual stimulation that causes blood vessels in the penis to relax and open. This allows you to achieve and maintain an erection. These medications don’t automatically trigger an erection; sexual arousal is needed to start the whole process.
Viagra, Levitra and Cialis each have a slightly different chemical make up. These minor differences affect the way they work, such as how quickly they take effect and wear off; how they interact with other medications; and side effects. Your doctor will consider these factors when deciding if one of these medications is a good choice for you. Your doctor will also consider any other health problems you have and whether any of your current medications could cause problems when taken with Viagra, Levitra or Cialis.
Although these erectile dysfunction medications can help many people, not all men can safely take them. Viagra, Levitra and Cialis may not be a good choice if you have: Continue reading Viagra and other oral medications that treat erectile dysfunction
Until the late 1990s, there were no truly effective oral medications for erectile dysfunction — the inability to achieve or sustain an adequate erection for sexual activity. The useful drugs that were available had to be injected into the penis or inserted into the urethra.
Treatment of erectile dysfunction is much easier now, thanks to 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 quickly they take effect and how long their effects 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 blood flow 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
The drugs have slightly different chemical compositions that affect how quickly they work and wear off. Other distinctions — for example, which drug may be best for men of different ages or with different medical conditions — aren’t known. No study has directly compared these three medications.
|Viagra (sildenafil)||Levitra (vardenafil)||Cialis (tadalafil)|
|Usual dose||50 milligrams (mg) a day||10 mg a day||10 mg a day|
|Maximum doses||100 mg a day||20 mg a day||20 mg a day|
|Available as||20 mg, 25 mg, 50 mg and 100 mg tablets||2.5 mg, 5 mg, 10 mg and 20 mg tablets||5 mg, 10 mg and 20 mg tablets|
|How to take||Without food||Without food||With or without food|
|When to take||30 to 60 minutes before sexual activity||30 to 60 minutes before sexual activity||30 minutes before sexual activity|
|Duration of effects||Up to four hours||Up to four hours||24 to 36 hours|
|How often to use||Up to once a day||Up to once a day||Up to once a day|
|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.
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.
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.