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[4] Some sildenafil users have complained of seeing everything tinted blue (cyanopsia). [24] This cyanopsia can be explained because sildenafil, while selective for PDE5, does have some affinity for PDE6, which is the phosphodiesterase found in the retina. Patients thus taking the drug may experience colorvision abnormalities. Some complained of blurriness and loss of peripheral vision. In July 2005, the US Food and Drug Administration (FDA) updated labeling for tadalafil (Cialis), vardenafil (Levitra), and sildenafil (Viagra) to reflect a small number of post-marketing reports of sudden vision loss, while acknowledging that "...it is not possible to determine whether these oral medicines for erectile dysfunction were the cause of the loss of eyesight or whether the problem is related to other factors such as high blood pressure or diabetes, or to a combination of these problems.
- Some men report improved confidence using sildenafil.
- Side effects are usually mild and temporary.
- Always follow your healthcare provider’s dosing recommendations.
"[25] A careful review of pooled data from clinical trials containing well documented information about the dose and duration of exposure to the drug for a large number of patients, yields no evidence for an increased risk of non-arteritic anterior ischemic optic neuropathy or other adverse ocular events associated with PDE5 inhibitor use. Rare but serious adverse effects found through postmarketing surveillance include prolonged erections, severe low blood pressure, myocardial infarction (heart attack), ventricular arrhythmias, stroke, increased intraocular pressure, and sudden hearing loss.
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[9] As of 2016,[update] their role more lovegra sildenafil generally in Raynaud's was not clear. Sildenafil has shown some potential for improving exercise performance at high altitudes. However, its overall efficacy is not clear. Sildenafil has been studied for high-altitude pulmonary edema (HAPE), but its use is currently not recommended for that indication. In clinical trials, the most common adverse effects of sildenafil use included headache, flushing, indigestion, nasal congestion, and impaired vision, including photophobia and blurred vision. [4] In October 2007, the FDA announced that the labeling for all PDE5 inhibitors, including sildenafil, required a more prominent warning of the potential risk of sudden hearing loss.
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Care should be exercised by people who are also taking protease inhibitors for the treatment of HIV infection.
- Sildenafil may cause side effects like nasal congestion.
- Some men experience visual disturbances.
- Seek medical help if experiencing an erection lasting over 4 hours.
Protease inhibitors inhibit the metabolism of sildenafil, effectively multiplying the plasma levels of sildenafil, increasing the incidence and severity of side effects.
Non-medical use
TelyRx provides patients with a telehealth service that allows a patient to receive a prescription upon approval from of the healthcare professionals that have partnered with us. We also offer the opportunity to for a physician to write a prescription through our platform so ask them to partner with us! If you have a paper prescription, it needs to be scanned and uploaded in the TelyRx system we will take the transfer from there. Sildenafil, sold under the brand name Viagra among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. [4][8] It is also sometimes used off-label for the treatment of certain symptoms in secondary Raynaud's phenomenon.
Sildenafil Side Effects
[9] It is unclear if it is effective for treating sexual dysfunction in females. [8] It can be taken orally (swallowed by mouth), intravenously (injection into a vein), or through the sublingual route (dissolved under the tongue). [8][10] Onset when taken orally is typically within twenty minutes and lasts for about two hours. Common side effects include headaches, heartburn, and flushed skin. [8] Caution is advised in those with cardiovascular disease.
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[8] Rare but serious side effects include vision problems, hearing loss, and prolonged erection (priapism) that can lead to damage to the penis. [8] Sildenafil should not be taken by people on nitric oxide donors such as nitroglycerin, as this may result in a serious drop in blood pressure. Sildenafil acts by blocking phosphodiesterase 5 (PDE5), an enzyme that promotes breakdown of cGMP, which regulates blood flow in the penis. [8] It requires sexual arousal to work, and does not by itself cause or increase sexual arousal. [8] It also results in dilation of the blood vessels in the lungs. Those using protease inhibitors are recommended to limit their use of sildenafil to no more than one 25 mg dose every 48 hours. [4] Other drugs that interfere with the metabolism of sildenafil include erythromycin and cimetidine, both of which can also lead to prolonged plasma half-life levels.
| Condition | Explanation | Recommendation |
|---|---|---|
| Use with Nitrates | Can cause dangerous hypotension | Avoid combination |
| Severe Cardiovascular Disease | Risk of adverse cardiac events | Consult a doctor before use |
| Retinitis Pigmentosa | Potential risk of vision loss | Use with caution or avoid |
| Hypotension | Low blood pressure | Monitor closely, avoid use if severe |
The use of sildenafil and an α1 blocker (typically prescribed for hypertension or for urologic conditions, such as benign prostatic hypertrophy) at the same time may lead to low blood pressure, but this effect does not occur if they are taken at least 4 hours apart. Concomitant use of nitric oxide donors, organic nitrites and nitrates,[30] such as: nitroglycerinisosorbide mononitrateisosorbide dinitratesodium nitroprussidealkyl nitrites (commonly known as "poppers") Concomitant use of soluble guanylyl cyclase stimulators, such as riociguat Sildenafil should not be used if sexual activity is inadvisable due to underlying cardiovascular risk factors. Sildenafil's popularity with young adults has increased over the years.
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Is it safe to order medications online? Reputable pharmacies like TelyRx prioritize safety and adhere to strict quality standards. We connect you with a licensed healthcare professional to help you get a valid prescription. We verify the prescription and provider before we ship prescription medications. To minimize risk, we carry only non-controlled substances.
How do I use the Viagra pill?
Additionally, we have encrypted payment systems and maintain your privacy by protecting your personal information. How long does it take to receive my order? The delivery time will vary based on the shipping method you choose. We can get it there as soon as next day depending on when your order is placed. We provide an estimated delivery time frame during the checkout process.
Recreational use
How do I get prescribed a medication if my doctor is not in the TelyRx system? TelyRx offers a quick and easy way to obtain a prescription by using telehealth. Your doctor doesn't need to be in the TelyRx system. The providers who use our site review the information that you certify is accurate, and then, relying on that information write a prescription for medicine that helps with what you're going through, if they deem it appropriate to do so in their professional judgement. How sildenafil 100mg lowest price can I transfer my prescription from my doctor? [32] Sildenafil's brand name, Viagra, is widely recognized in popular culture, and the drug's association with treating erectile dysfunction has led to its recreational use. [33] The reasons behind such use include the belief that the drug increases libido, improves sexual performance,[33] or permanently increases penis size.
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Pfizer originally discovered the medication in 1989 while looking for a treatment for angina. [11] It was approved for medical use in the United States and in the European Union in 1998. [5][8][11][12] In 2023, it was the 151st most commonly prescribed medication in the United States, with more than 3 million prescriptions. [13][14] It is available as a generic medication. [15][16] In the United Kingdom, it is available as a pharmacy medicine.
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The primary indication of sildenafil is treatment of erectile dysfunction (inability to sustain a satisfactory erection to complete sexual intercourse). Its use is now one of the standard treatments for erectile dysfunction, including for males with diabetes mellitus. Tentative evidence suggests that sildenafil may help males who experience antidepressant-induced erectile dysfunction. While sildenafil improves some markers of disease in people with pulmonary arterial hypertension, it does not appear to affect the risk of death or serious side effects. Sildenafil and other PDE5 inhibitors are used off-label to alleviate vasospasm and treat severe ischemia and ulcers in fingers and toes for people with secondary Raynaud's phenomenon;[9][21] these drugs have moderate efficacy for reducing the frequency and duration of vasospastic episodes. [34] Studies on the effects of sildenafil when used recreationally are limited, but suggest it has little effect when used by those who do not have erectile dysfunction. In one study, a 25 mg dose was shown to cause no significant change in erectile quality, but did reduce the postejaculatory refractory time. [35] This study also noted a significant placebo effect in the control group. Unprescribed recreational use of sildenafil and other PDE5 inhibitors is noted as particularly high among users of illegal drugs. [36] Sildenafil is sometimes used sildenafil 20 mg prescription to counteract the effects of other substances, often illicit. [33] Some users mix it with methylenedioxymethamphetamine (MDMA, ecstasy), other stimulants, or opiates in an attempt to compensate for the common side effect of erectile dysfunction, a combination known as "sextasy", "rockin' and rollin'", "hammerheading", or "trail mix".
| Parameter | Value | Notes |
|---|---|---|
| Absorption | Rapid, peak plasma levels in ~1 hour | Food intake delays absorption |
| Bioavailability | ~40% | Variable among individuals |
| Metabolism | Liver (CYP3A4 enzyme) | |
| Half-life | About 4 hours |
[33] Mixing it with amyl nitrite, another vasodilator, is particularly dangerous and potentially fatal. The 2007 Ig Nobel Prize in aviation went to Patricia V. Agostino, Santiago A. Plano, and Diego A. Golombek of Universidad Nacional de Quilmes, Argentina, for their discovery that sildenafil helps treat jet lag recovery in hamsters. Professional athletes have been documented using sildenafil, believing the opening of their blood vessels will enrich their muscles.
- Do not take sildenafil if you have a recent stroke or heart attack.
- Combining sildenafil with certain drugs can be dangerous.
- Inform your doctor of all medications before use.
In turn, they believe it will enhance their performances. Acetildenafil and other synthetic structural analogs of sildenafil which are PDE5 inhibitors have been found as adulterants in a number of "herbal" aphrodisiac products sold over-the-counter. [41] These analogs have not undergone any of the rigorous testing that drugs like sildenafil have passed, and thus have unknown side-effect profiles. [42] Some attempts have been made to ban these drugs, but progress has been slow so far, as, even in those jurisdictions that have laws targeting designer drugs, the laws are drafted to ban analogs of illegal drugs of abuse, rather than analogs of prescription medicines.
| Off-label Use | Description | Evidence Level |
|---|---|---|
| Altitude sickness prevention | Assists in pulmonary vasodilation | Limited studies |
| Female sexual arousal disorder | Investigated for enhancing female libido | Experimental |
| Heart failure | Potential to improve cardiac output | Preliminary research |