Label: SILDENAFIL- sildenafil citrate injection, solution

And it also means that scientists are investigating uses for the drug in patients with an array of vascular disorders having nothing to do with sexual function.

• The onset of action for sildenafil 10mg is usually within 30 minutes.
• It is important to follow prescribed intervals between doses.
• Sildenafil is not intended for recreational use.
• Consult your doctor if you experience prolonged erections.
• Women should avoid using sildenafil unless prescribed for pulmonary hypertension.

They have nearly identical effects on ED as well as similar side effects.

Comparing Which Works Faster

Another interesting property is sildenafil's ability to protect the heart from excessive stimulation by adrenaline. Clinical trials will be needed to see which patients might benefit. It's the most speculative use for sildenafil, and it's far from clinical application. Still, it's an interesting area of new research. A European study of 25 men who had erectile dysfunction but no other circulatory disorders found that blood vessels in the brain responded to stress better after a 50-mg dose of sildenafil.

Revatio Tablets

More interesting results were reported by scientists in Michigan, who produced ischemic strokes in rats by temporarily blocking blood vessels. During their recovery, the animals were divided into three groups. One received no treatment, another low-dose sildenafil, and the third high-dose sildenafil. The animals who got sildenafil recovered better, with the highest doses producing the best results. The scientists concluded that the medication actually stimulated the growth of new nerve cells in the brain tissue next to the stroke damage. Because they are newer drugs, scientists are just beginning to study them for problems that don't involve sexuality. Sildenafil has already been licensed to treat men and women with pulmonary hypertension.

Time will tell if any of these drugs will fill other potentials beyond promoting potency. As a service to our readers, Harvard Health Publishing provides access to our library of archived content. Please note the date of last review or update on all articles.

What Other Drugs Interact with Sildenafil?

It's far too early to know whether sildenafil may someday help people with strokes. If you get your information about sildenafil from Super Bowl commercials or e-mail spam, you might dismiss it as a lifestyle drug of little real medical importance. In fact, it's a serious prescription medication that has helped millions of men who are distressed by an entirely legitimate medical problem. Because the drug acts on arteries beyond the penis, it can produce various side effects. That means it should only be prescribed by a personal physician who really knows you. No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinician. The proper dosage for sildenafil (Viagra) will vary between 25mg and 100mg once daily, with the most prescribed dosage being 50mg. Patients generally start with a lower dosage of 25mg to 50mg and depending on how the starting dosage works including how well it interacts with the body, may move to a higher dosage for a better experience.

Frequently asked questions

Temporarily deprived of adequate blood flow, the involved digits become pale, cold, and very painful. It's a common condition, affecting up to 8% of men and 17% of women. In the vast majority, there are no underlying diseases (primary Raynaud's), and patients do well simply by minimizing their exposure to cold. But secondary Raynaud's can complicate collagen-vascular diseases or certain other conditions. It's not common, but secondary Raynaud's can be very painful and difficult to treat.

Hazard Classifications

Many medications have been used without consistent success. But a 2005 study of 16 patients with severe Raynaud's phenomenon that had not responded to other medications reported benefit from sildenafil in a dose of 50 mg twice a day. And a 2006 study of 40 Raynaud's patients reported similar benefits from vardenafil in a dose of 10 mg twice a day. Sildenafil was discovered by scientists looking for a new medication to dilate coronary arteries. It does that, but because it widens healthy coronary arteries more than diseased vessels, it has not been successful in treating angina.

Does the price of sildenafil vary based on strength or what it is prescribed for?

But it may have other benefits for cardiac patients. In the first years of the Viagra era, research on sildenafil and the heart was devoted to making sure the drug was safe for the circulation. In most men with heart disease, it is. But several studies of patients with congestive heart failure also reported that the medication improves oxygen consumption, pulmonary artery pressure, and exercise capacity in these patients. Research shows that sildenafil helps the heart sildenafil spray muscle relax properly, which could help patients with heart failure due to diastolic dysfunction. (1) For treating erectile dysfunction (or ED), sildenafil is normally only taken on an as needed basis, 30-60 minutes before sexual activity but can be dosed between 30 minutes and 4 hours before sexual activity.

What is tadalafil?

This group includes patients with stable angina, previous heart attacks, mild congestive heart failure, well-controlled hypertension, and previous strokes. But men with recent heart attacks and strokes should wait until they have recovered fully, and patients with unstable blood pressure, active angina, or any other complex or unusual problem should hold off and get specific medical guidance. And men who take alpha blockers (particularly terazosin, or Hytrin, and doxazosin, or Cardura) for hypertension or benign prostatic hyperplasia (BPH) should use ED pills (particularly vardenafil or tadalafil) with great caution, if at all. Studies also suggest that sildenafil may increase respiratory distress in men with severe sleep apnea and that it slows gallbladder function, which might increase the risk of gallstones. Scientists who noticed that the ED pills can produce side effects in many parts of the body are asking if they can also serve therapeutic roles beyond male (or female) sexuality.

Postmarketing Reports

Because of its seniority, most of the research has used sildenafil, so it's not clear if the newer medications will fill similar roles. But for sildenafil, at least, some new uses appear promising. It's the only nonsexual condition that has earned FDA approval for sildenafil. But since it's a serious problem, any benefit is most welcome. When we think of blood pressure, we usually think of the systemic circulation, of the blood pumped from the heart's left ventricle to the aorta and then to the smaller arteries that carry oxygen-rich blood throughout the body.

Pregnancy Categories

But to pick up vital oxygen, blood must first pass from the less powerful right ventricle through the pulmonary artery to the lungs, then back to the left side of the heart. The pressures in the pulmonary artery are much lower (about 20/10 millimeters of mercury, or mm Hg) than in the aorta (lower than 120/80 mm Hg is considered healthy). Exercise is the most common cause of rising pulmonary artery pressure, but the elevation is mild and subsides promptly with rest. High altitudes are another cause, which can lead to mountain sickness (see below). Far more serious are the large number of lung diseases, vascular diseases, heart disorders, and miscellaneous conditions that can cause pulmonary hypertension. Sildenafil treats erectile dysfunction by selectively inhibiting an enzyme known as phosphodiesterase type 5, which allows corpus cavernosum smooth muscle to relax, making erections during sexual stimulation more satisfactory. (2) An erection is achieved in a response cycle that begins with sildenafil producing arteriolar dilatation and increased blood flow to the erectile tissue of the penis.

• Sildenafil 10mg may be more suitable for older adults with sensitivity.
• Do not take more than one dose in 24 hours.
• Do not mix sildenafil with recreational drugs like poppers.
• Be aware that certain foods and medications can influence its effects.
• Regular medical check-ups are recommended when using sildenafil regularly.

(3) In a study on different dosages for treating erectile dysfunction with sildenafil, it was found that both 50 mg and 100 mg doses of sildenafil improved erectile function, sexual satisfaction, and enjoyment in patients, however the 100 mg dose had slightly better results.

Higher doses led to improved sexual frequency and enjoyment, especially for patients with more severe cases of ED or if the patient had any additional health conditions. The overall findings suggest that adjusting the sildenafil dosage can optimize treatment for an improved outcome and many patients who start at 50mg, request a higher dosage later on.

• The drug is generally safe when used as prescribed.
• Patients should inform their doctor about all health conditions.
• Sildenafil 10mg is sometimes used to treat high-altitude pulmonary hypertension.
• Do not take sildenafil with heavy or fatty foods for better absorption.
• Store the medication at room temperature away from moisture.

The common tablet dosages for sildenafil when treating erectile dysfunction are 25mg, 50mg, and 100mg with 50mg being the dosage most often initially prescribed and with dosages designed for once daily dosing.

Before Using

And in primary pulmonary hypertension, no underlying cause is evident. Pulmonary hypertension causes shortness of breath, first during exertion but eventually at rest if the condition progresses. A variety of treatments are available, depending on the underlying problem. And the FDA has approved sildenafil (Revatio) in a dose of 20 mg three times a day for men and women with pulmonary hypertension. Clinical trials have demonstrated improved exercise tolerance with few side effects.

At what dose is Sildenafil typically prescribed?

Pulmonary hypertension is a feature of acute mountain sickness. High altitudes produce low blood-oxygen levels. In turn, low oxygen produces a narrowing of the pulmonary arteries. The heart must therefore work harder, reducing the capacity to exercise. To find out if it might improve exercise capacity in low oxygen conditions, scientists tested 14 healthy mountain climbers in a lab in Germany and again at a Mount Everest base camp.

ED Prescriptions for $1-2 Per Pill

In the lab, the volunteers breathed 10% oxygen through a mask; on the mountain, they breathed natural air. Under both conditions, a 50-mg sildenafil tablet decreased pressures in the lungs' blood vessels and increased the maximum exercise capacity. It's a small study, and it's too soon to say if sildenafil will help prevent or treat acute mountain sickness. Still, a study of 29 climbers reported that tadalafil can also reduce pulmonary artery pressure at a high altitude. In affected individuals, exposure to the cold triggers spasm of the small arteries that supply blood to the fingers, toes, or both. (4) Professor Irwin Goldstein noted in a presentation on sildenafil in 2003 that taking a quarter pill of sildenafil every night was effective in preventing erectile dysfunction. “If you would like to be sexually active in five years' time, take a quarter of a pill a night, we have data to show that will facilitate and prolong nocturnal erections.” Speak with your doctor if you have been taking sildenafil as needed and want to try switching to a daily micro dose.

• Sildenafil 10mg is commonly used to treat erectile dysfunction.
• It works by relaxing blood vessels in the penis.
• The medication is typically taken about 30-60 minutes before activity.
• Sildenafil 10mg can be prescribed for certain pulmonary conditions.
• Always follow your doctor’s dosage instructions carefully.