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.
| Condition | Caution Level | Explanation |
|---|---|---|
| Heart disease | High | Increased risk of cardiac events |
| Nitroglycerin medication | Absolute | Can cause dangerous drop in blood pressure |
| Liver impairment | Moderate | Altered drug metabolism |
| Recent stroke or heart attack | High | Risk of recurrence or complications |
But for sildenafil, at least, some new uses appear promising. It's the only nonsexual condition that has earned FDA approval for sildenafil.
Detection in biological fluids
Do not give VIAGRA to other people, even if they have the same symptoms that you have. This Patient Information leaflet summarizes the most important information about VIAGRA. If you would like more information, talk with your healthcare provider. You can ask your healthcare provider or pharmacist for information about VIAGRA that is written for health professionals. For more information, go to or call 1-888-4VIAGRA Inactive ingredients: microcrystalline cellulose, anhydrous dibasic calcium phosphate, croscarmellose sodium, magnesium stearate, hypromellose, titanium dioxide, lactose, triacetin, and FD & C Blue #2 aluminum lake This Patient Information has been approved by the U.S.
Can Viagra be crushed, split, or chewed?
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Viagra for ED
When the history of men's health is written, 1998 will go down as a banner year. That's when sildenafil (Viagra) was approved by the FDA to treat erectile dysfunction (ED). But when the history of sildenafil is written, 2005 will also be special. That's when the FDA approved the medication that revolutionized male sexuality for a nonsexual condition. The illness is pulmonary hypertension, and sildenafil is prescribed for it under the brand name Revatio. But since it's a serious problem, any benefit is most welcome.
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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.
12.3 Pharmacokinetics
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. 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.
Natural and over-the-counter alternatives for ED
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. 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.
How can I tell if Viagra’s not working?
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. 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. 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).
8.6 Renal Impairment
In almost every case, these side effects are mild and transient. But new information has added a rare eye disease to the list. 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.
Can you take Viagra if you have high blood pressure?
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. 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.
Does Viagra work the first time you use it?
Nitrates are medications that temporarily widen arteries by increasing their supply of nitric oxide. That's how they widen partially buy generic viagra online blocked coronary arteries in patients with angina. 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). Exercise is the most common cause of rising pulmonary artery pressure, but the elevation is mild and subsides promptly with rest.
- Viagra mimics the effects of natural nitric oxide in the body.
- It is important to take Viagra exactly as prescribed.
- The medication can cause headaches due to vasodilation.
- Viagra’s onset and duration vary among users.
- Exercise caution if you experience chest pain or severe dizziness.
- Always inform your doctor about any other medications taken.
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 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.
- Viagra has helped millions of men regain sexual confidence.
- The medication can be part of a broader approach to sexual health.
- Proper dosing is vital to avoid adverse effects.
- Always read the patient information leaflet thoroughly.
- Be aware of potential interactions with other prescriptions.
- Open communication with your doctor leads to better outcomes.
Clinical trials have demonstrated improved exercise tolerance with few side effects. Pulmonary hypertension is a feature of acute mountain sickness.
- Viagra’s effectiveness may vary based on age, health, and dosage.
- It can interact with medications like nitrates, causing dangerous drops in blood pressure.
- Do not use Viagra if you have severe heart or liver conditions.
- Over-the-counter Viagra is not approved and may be unsafe.
- Sexual stimulation is needed for Viagra to work effectively.
- Always buy Viagra from a licensed pharmacy.
High altitudes produce low blood-oxygen levels.
| Tip | Explanation | Best Practice |
|---|---|---|
| Take on an empty stomach | Food can delay absorption | 1 hour before planned activity |
| Avoid alcohol | Can increase side effects | Limit or avoid before use |
| Follow prescribed dose | Overdose risks | Consult doctor for correct dose |
| Avoid grapefruit juice | Interferes with drug metabolism | Drink water instead |
In turn, low oxygen produces a narrowing of the pulmonary arteries.
Learn more
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. 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. The heart must therefore work harder, reducing the capacity to exercise.
How does Viagra work for ED?
Sildenafil was the first effective oral medication for ED. Although there are some differences between these drugs (vardenafil starts working sooner and tadalafil works longer), they all act in exactly the same way to combat ED. The three drugs are so similar because they share a common target, an enzyme called phosphodiesterase-5 (PDE-5). To understand why blocking PDE-5 improves sexual function, however, you have to know how erections develop. Normal erections require a receptive state of mind, adequate levels of testosterone, and healthy arteries, veins, and nerves.
Is Viagra safe to use?
But they also require a tiny chemical messenger called nitric oxide (NO). It serves two crucial functions: transmitting the impulses of arousal between viagra vardenafil 20mg nerves and relaxing the smooth muscle cells in the arteries, allowing them to widen and admit more blood to the penis. Nitric oxide is essential because it signals the arterial cells to produce cyclic guanosine monophosphate (cGMP), the chemical that increases the flow of blood to the penis. But the tissues of the penis also produce PDE-5, the enzyme that breaks down cGMP. In normal circumstances, the penis generates enough cGMP to produce a rigid erection and enough PDE-5 to end the erection when ejaculation is complete.
Long-term use
In many men with ED, this intricate system is out of balance, but one of the three oral medications can often make it right. By inhibiting PDE-5, they increase the supply of cGMP, which for many men will allow erections to develop. 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. 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.
| Brand Name | Active Ingredient | Manufacturer | Price Range ($) | Availability |
|---|---|---|---|---|
| Viagra | Sildenafil citrate | Pfizer | 20-50 per pill | U.S. and globally |
| Kamagra | Sildenafil citrate | Ajanta Pharma | 10-35 per pill | Online |
| Sildenafil CT | Sildenafil citrate | Various | 15-40 per pill | Online/Pharmacies |
| Vivanza | Vardenafil | Menarini | 25-60 per pill | Europe & Asia |
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