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High altitudes produce low blood-oxygen levels. In turn, low oxygen produces a narrowing of the pulmonary arteries.

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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.

Aspect	Effect	Timeframe	Notes
Erection quality	Improved	After 30 min	Enhanced rigidity
Libido	Increased (indirect)	Within 1 hour	May vary among individuals
Perception of endurance	No direct effect	-	May feel more confident
Satisfaction levels	Higher reported rates	After sex	Dependent on other factors

In the lab, the volunteers breathed 10% oxygen through a mask; on the mountain, they breathed natural air.

• Viagra enhances sexual performance by improving erectile firmness.
• It is available by prescription and should follow a doctor’s guidance.
• Viagra does not increase sexual desire, only aids in erection.
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• It is important to not take more than one tablet per day.

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.

8.4 Pediatric Use

Both factors explain why the ED pills sometimes produce side effects in many parts of the body. The most common side effects are headaches and facial flushing, which occur in about 15% of men. Other reactions include nasal congestion, indigestion, and back pain; blue-tinged vision is even less common. In almost every case, these side effects are mild and transient. But new information has added a rare eye disease to the list.

Side effect details

Nonarteritic anterior ischemic optic neuropathy (NAION) is a poorly understood disorder that can cause blindness. In March 2005, doctors reported that seven men experienced visual impairment within hours of using sildenafil. Since then, additional cases have been reported to the FDA related to sildenafil, tadalafil, and vardenafil. Fortunately, the number of cases is very small in relation to the millions of men who have used ED pills successfully. It's not clear that there is a cause-and-effect relationship between ED pills and NAION.

Is Viagra a blood thinner?

At present, the concern is not great enough to prevent men from using these pills, but all men should use them carefully and responsibly. The most important worry about ED pills is their ability to widen arteries enough to lower blood pressure. It's rarely a problem in healthy men, but it explains a crucial precaution that applies to all three medications. Nitrates are medications that temporarily widen arteries by increasing their supply of nitric oxide. That's how they widen partially blocked coronary arteries in patients with angina. In affected individuals, exposure to the cold triggers spasm of the small arteries that supply blood to the fingers, toes, or both. 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. 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.

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And a 2006 study of 40 Raynaud's patients reported similar benefits from vardenafil in a dose of 10 mg twice a day.

2.3 Dosage Adjustments in Specific Situations

But because the nitrates and ED pills all act on nitric oxide, they do not mix. Men who are taking nitrates should never use any of the ED pills. This ban includes all preparations of nitroglycerin (short-acting, under-the-tongue tablets or sprays); long-acting nitrates (isosorbide dinitrate, or Isordil, Sorbitrate, and others, and isosorbide mononitrate, Imdur, ISMO, and others); nitroglycerin patches and pastes; and amyl nitrite (so-called poppers, used for sexual stimulation by some men). ED pills are quite safe for men with stable cardiovascular disease who do not take nitrates. This group includes patients with stable angina, previous heart attacks, mild congestive heart failure, well-controlled hypertension, and previous strokes.

What is the purpose of a Viagra-like pill?

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. Because of its seniority, most of the research has used sildenafil, so it's not clear if the newer medications will fill similar roles.

What drugs interact with Viagra (sildenafil)?

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. 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. Sildenafil was discovered by scientists looking for a new medication to dilate coronary arteries.

Proper Use

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. And in primary buy generic viagra online pulmonary hypertension, no underlying cause is evident.

Jet lag research

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. Pulmonary hypertension is a feature of acute mountain sickness. It does that, but because it widens healthy coronary arteries more than diseased vessels, it has not been successful in treating angina. But it may have other benefits for cardiac patients.

Aspect	Explanation	Notes
Physical capability	Improves ability to achieve erection	Leads to better performance
Psychological effect	Reduces performance anxiety	Boosts self-esteem
Spontaneity	Encourages natural arousal	Less planning needed
Satisfaction	Increased partner satisfaction	Results depend on communication

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 muscle relax properly, which could help patients with heart failure due to diastolic dysfunction. 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.

• Viagra can be part of a comprehensive treatment plan for ED.
• The medication is not suitable for everyone, especially those on certain medications.
• Viagra can sometimes cause side effects like indigestion or back pain.
• It’s advised to avoid heavy physical activity after taking Viagra.
• The effectiveness of Viagra may improve over time with consistent use.
• Always check for potential drug interactions before use.

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. 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.

5.4 Hearing Loss

In test tubes, vardenafil and tadalafil inhibit PDE-5 a bit more effectively than sildenafil does. But laboratory potency doesn't necessarily predict clinical activity. In this case, it means that lower doses of the newer drugs will achieve comparable results to the older drug's success rate. Vardenafil is marketed in 2.5-, 5-, 10-, and 20-milligram (mg) tablets; tadalafil in doses of 5, 10, and 20 mg; and sildenafil, 25, 50, and 100 mg. Each produces better results at higher doses, but the top doses are also more likely to cause side effects.

What are the side effects of using flibanserin?

And all the drugs are more effective in men with mild ED than in those who are severely impaired. Doctors have had more clinical experience with sildenafil than its newer rivals. Still, all three drugs seem to achieve similar results. In broad terms, about 70% of men benefit. The response is best in men with no identifiable organic cause of ED (about 90%), but it's less favorable for diabetics (about 50%), and it's hard to predict for men who have been treated for prostate cancer.

Does Viagra prevent ejaculation?

If PDE-5 were found exclusively in the penis, the side effects of these drugs would be limited to that obdurate organ; in fact, a rare side effect is priapism, painful prolonged erections that require urgent treatment. But small amounts of PDE-5 are found in blood vessels in other parts of the body. In addition, PDE-5 is just one of 11 enzymes in the phosphodiesterase family. The others are concentrated in different parts of the body. While the ED pills have a much greater affinity for PDE-5 than the other PDEs, they have some ability to inhibit those closely related enzymes. The animals who got sildenafil recovered better, with the highest doses producing the best results.