The Mechanism of Action: How Sildenafil Works

Sildenafil has shown some potential for improving exercise performance at high altitudes.

Medication Class	Specific Drugs	Interaction Effect
Nitrates	Nitroglycerin, Isosorbide	Severe hypotension
Alpha-blockers	Tamsulosin, Doxazosin	Postural hypotension
CYP3A4 inhibitors	Ketoconazole, Ritonavir	Increased sildenafil levels

However, its overall efficacy is not clear.

Side Effect	Frequency	Severity	Recommended Action
Headache	Common	Mild	Usually resolves; analgesics if needed
Flushing	Common	Mild	Cold compress, reassurance
Nasal Congestion	Moderate	Mild to Moderate	Decongestants with caution
Dizziness	Moderate	Mild to Moderate	Sit or lie down; avoid driving

Sildenafil has been studied for high-altitude pulmonary edema (HAPE), but its use is currently not recommended for that indication.

Comparing the Mechanism of Action

Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them: pain or tenderness around the eyes and cheekbones diarrhea or stomach cramps (severe or continuing) numbness or tingling of the hands, legs, or feet redness, soreness, swelling, or bleeding of the gums sensation of motion, usually whirling, either of one's self or of one's surroundings sexual problems in men (continuing), including failure to experience a sexual orgasm sores in the mouth and on the lips Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional. Generic for Viagra ® contains Sildenafil, a doctor-trusted ingredient that is effective for treating ED, which means that it is just as effective for the treatment of erectile dysfunction as the original ED medication. Generic Viagra® is a PDE5 (phosphodiesterase type 5) inhibitor, which works by blocking the PDE5 enzyme, which in turn temporarily relaxes smooth muscle and improves blood flow to the penis during sexual stimulation.

Does Viagra help me keep an erection after ejaculation?

While Viagra® is easily recognizable as the “little blue pill,” the generic for Viagra® comes in many different colors and shapes. Authentic pills may be white or blue, round or diamond, etc. The cost of a generic for Viagra® tablet varies based on the strength of the dose of sildenafil it contains, but generally costs anywhere from about $4 to $10 per dose, compared to $50 to $70 per dose for brand-name Viagra®. Through Hims, generic for Viagra® costs 95% less than branded Viagra®. Generic for Viagra ® contains Sildenafil, a doctor-trusted ingredient that is effective for treating ED. 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.

Product	Dosage	Quantity + Bonus	Price
Viagra Generic	100mg	90 + 6 Pills	129.02€ 122.88€	Buy
Viagra Original	100mg	76 + 4 Pills	306.59€ 291.99€	Buy
Viagra Super Active	100mg	120 + 16 Pills	198.37€ 188.92€	Buy
Viagra Professional	100mg	10 Pills	44.09€ 41.99€	Buy
Viagra Oral Jelly	100mg	90 + 8 Sachets	258.02€ 245.73€	Buy
Viagra Super Active	100mg	90 + 10 Pills	165.61€ 157.72€	Buy
Viagra Generic	150mg	60 + 4 Pills	111.25€ 105.95€	Buy
Viagra Oral Jelly	100mg	110 + 9 Sachets	284.63€ 271.08€	Buy
Viagra Generic	150mg	360 + 10 Pills	423.48€ 403.31€	Buy
Viagra Generic	50mg	30 + 4 Pills	54.26€ 51.68€	Buy
Viagra Super Active	100mg	20 + 4 Pills	48.05€ 45.76€	Buy
Viagra Generic	200mg	90 + 6 Pills	170.79€ 162.66€	Buy
Viagra Original	100mg	4 Pills	40.94€ 38.99€	Buy
Viagra Professional	100mg	270 + 6 Pills	456.97€ 435.21€	Buy
Viagra Oral Jelly	100mg	63 + 7 Sachets	190.54€ 181.47€	Buy
Viagra Generic	50mg	90 + 6 Pills	107.37€ 102.26€	Buy
Viagra Generic	150mg	270 + 10 Pills	326.61€ 311.06€	Buy

[4] Some sildenafil users have complained of seeing everything tinted blue (cyanopsia).

More about sildenafil

Multiple companies make generic for Viagra®, including Teva Pharmaceuticals and Greenstone, a subsidiary of Pfizer Inc. Take sildenafil (generic for Viagra®) about one hour before sexual activity, as it takes about 30 minutes to an hour to begin working. Check out our guide on how to take Viagra® for best results. If you are currently taking any over-the-counter, recreational or prescription drugs or supplements, tell your healthcare provider. Some medications, like nitroglycerin (nitrates), isosorbide dinitrate, riociguat, ritonavir, itraconazole, ketoconazole, alpha blockers and “poppers”, have well-documented drug interactions with sildenafil and could cause serious side effects.

Sildenafil Tablets for ED

If you are currently taking a PDE5 inhibitor, like Revatio for pulmonary arterial hypertension, talk to your doctor about adjusting your dosage. There are also some rare, serious side effects of sildenafil, namely an allergic reaction, loss of vision/hearing, or priapism, an erection lasting for more than four hours. Seek emergency medical attention if you experience any of these serious side effects. Learn more about the common warnings and precautions to consider before taking generic Viagra®. You can get the generic for Viagra® through an online or local pharmacy with a prescription from a licensed medical provider. [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.

• Generic Viagra is usually less expensive than brand-name versions.
• Follow prescribed doses; do not double doses if one is missed.
• It does not increase libido but boosts the ability to achieve an erection.
• Use only as directed by a healthcare provider.

Patients thus taking the drug may experience colorvision abnormalities.

• Sildenafil citrate is a well-studied PDE5 inhibitor for ED treatment.
• It should only be used under medical supervision, especially in older adults.
• The medication's effectiveness depends on overall cardiovascular health.
• Always read the patient information leaflet thoroughly before use.

Some complained of blurriness and loss of peripheral vision.

Overdose/Missed Dose

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. [9] As of 2016,[update] their role more generally in Raynaud's was not clear. In July 2005, the US Food and Drug Administration (FDA) updated labeling for tadalafil (Cialis), vardenafil (Levitra), and sildenafil

Who is Sildenafil suitable for?

[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. The primary indication of sildenafil is treatment of erectile dysfunction (inability to sustain a satisfactory erection to complete sexual intercourse). (Viagra) to reflect a small number of post-marketing reports of sudden vision loss, while acknowledging that "...it is not possible

Detection in biological fluids

Generic for Viagra® is not available over-the-counter. To get genuine generic for Viagra®, ensure that you are seeing a healthcare provider licensed in your state and have your prescription filled by a qualified pharmacy, one that is licensed in your state and has 3rd-party accreditations like LegitScript. 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. [9] It is unclear if it is dapoxetine viagra effective for treating sexual dysfunction in females.

What’s the best sildenafil dosage for beginners?

[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. [8] Rare but serious side effects include vision problems, hearing loss, and prolonged erection (priapism) that can lead to damage to the penis. 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.

• Generic Viagra offers a cost-effective alternative to brand-name Sildenafil.
• It may be prescribed for various durations depending on the patient.
• Proper hydration can enhance the medication's effectiveness.
• Immediate medical attention is required in case of allergic reactions.

"[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

• Use of generic Viagra is contraindicated for those with heart conditions.
• Regular medical check-ups are advised while using sildenafil.
• The medication may cause priapism, an erection lasting over 4 hours.
• Alcohol intake can impair the effectiveness of the drug.

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.

Standard	Details
Good Manufacturing Practice (GMP)	Must meet GMP standards for safety and efficacy
Active Pharmaceutical Ingredient (API) Purity	Usually >99% pure
Packaging	Tamper-proof, properly sealed, labeled accurately

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.

Do you sell TEVA Sildenafil, and if not what brands do you sell?

[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. Pfizer originally discovered the medication in 1989 while looking for a treatment for angina. [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.

Non-medical use

Read more about the cost of generic Viagra® and brand-name Viagra® on our blog. The Generic for Viagra ® is called Sildenafil Citrate. This means that the generic form of Viagra ® will have the same therapeutic effect, but at a lower cost Yes, generic forms of Viagra® are just as safe as Viagra®. Both Viagra® and generic for Viagra® were approved by the Food and Drug Administration (FDA) to treat ED and millions of men have used Viagra® or the generic for Viagra® to treat their erectile dysfunction. Generic medications do not compromise the safety of a medication.

Factors That Influence the Right Dosage for You

The cost is lower than brand name medication for many reasons, most notably because the brand name medication is no longer legally protected against competition from other manufacturers. Generic for Viagra® may not be safe for men with some pre-existing conditions or who are taking medications that may interact with the drug. If you have (or have ever had) heart problems (such as a heart attack), heart disease, irregular heartbeat, angina, chest pain, narrowing of the aortic valve, heart failure, heart surgery, pulmonary hypertension including pulmonary arterial hypertension, stroke, low blood pressure, high blood pressure, a deformed penis shape (Peyronie’s Disease), priapism (an erection that lasts for more than 4 hours), sickle cell anemia, multiple myeloma, leukemia, retinitis pigmentosa (a rare genetic eye disease), severe vision loss (such as NAION), bleeding problems, stomach ulcers, liver problems or kidney problems (such as kidney dialysis), you may be at higher risk for adverse effects. If you have any of these health conditions, or any other health condition, tell your healthcare provider. Your provider should be aware of all medical conditions, prescription drugs and over-the-counter meds that you are taking.