If taken with a high-fat meal, absorption is reduced; the time taken to reach the maximum
Non-medical use
[34] Studies on the effects of sildenafil when used recreationally are limited, but yellow viagra pill 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 to counteract the effects of other substances, often illicit.
Does sildenafil interact with foods or drinks?
[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". [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. plasma concentration increases by around one hour, and the maximum concentration itself is decreased by nearly one-third.
- Viagra helps men achieve and maintain an erection sufficient for sexual activity.
- Indian pharmacies often offer discount programs on generic Viagra.
- Education campaigns in India aim to increase awareness of erectile dysfunction treatment.
- The safety profile of Indian Viagra is comparable to international standards when used correctly.
- Some Indian brands of Viagra include trademarks like Revatio, Viagra, and Kamagra.
- Viagra is sometimes used off-label for other medical conditions in India.
- It’s vital to store Viagra in a cool, dry place away from direct sunlight.
- Men with heart problems should consult a doctor before using Viagra.
- Indian regulators periodically review sildenafil products for quality, safety, and efficacy.
- Online reviews can help consumers identify trusted sources of Indian Viagra.
When taken orally, sildenafil for erectile dysfunction results in an average time
| Product | Dosage | Quantity + Bonus | Price | |
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| Viagra Generic | 100mg | 60 + 4 Pills | 96.36€ 91.77€ | |
| Viagra Oral Jelly | 100mg | 63 + 7 Sachets | 190.54€ 181.47€ | |
| Viagra Generic | 50mg | 60 + 4 Pills | 83.93€ 79.93€ | |
| Viagra Oral Jelly | 100mg | 90 + 8 Sachets | 258.02€ 245.73€ | |
| Viagra Generic | 200mg | 20 Pills | 61.69€ 58.75€ | |
| Viagra Oral Jelly | 100mg | 110 + 9 Sachets | 284.63€ 271.08€ | |
| Viagra Professional | 100mg | 30 Pills | 88.92€ 84.69€ | |
| Viagra Generic | 25mg | 90 + 6 Pills | 105.03€ 100.03€ | |
| Viagra Original | 100mg | 22 + 2 Pills | 120.71€ 114.96€ | |
| Viagra Soft Tabs | 100mg | 20 Pills | 62.99€ 59.99€ | |
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| Viagra Professional | 100mg | 360 + 6 Pills | 527.09€ 501.99€ | |
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| Viagra Generic | 100mg | 30 + 4 Pills | 60.91€ 58.01€ |
to onset of erections of 27 minutes (ranging from 12 to 70 minutes). Sublingual use of sildenafil for erectile dysfunction results in an average onset of action of 15 minutes and lasting for an average of 40 minutes.
What is Sildenafil Citrate?
Nitric oxide (NO) in the corpus cavernosum of the penis binds to guanylate cyclase receptors, which results in increased levels of cGMP, leading to smooth muscle relaxation (vasodilation) of the intimal cushions of the helicine arteries. This smooth muscle relaxation leads to vasodilation and increased inflow of blood into the spongy tissue of the penis, causing an erection. [49] Robert F. Furchgott, Ferid Murad, and Louis Ignarro won the Nobel Prize in Physiology or Medicine in 1998 for their independent study of the metabolic pathway of nitric oxide in smooth muscle vasodilation. The viagra jelly sachets uk molecular mechanism of smooth muscle relaxation involves the enzyme CGMP-dependent protein kinase, also known as PKG. The preparation steps for synthesis of sildenafil are:[54] Methylation of 3-propylpyrazole-5-carboxylic acid ethyl ester with hot
| Side Effect | Frequency (%) | Severity Level | Advice |
|---|---|---|---|
| Headache | 35 | Mild | Analgesics recommended |
| Flushing | 25 | Mild | Hydration advised |
| Nasal Congestion | 15 | Mild | Decongestants may help |
| Dizziness | 10 | Moderate | Avoid driving until stable |
| Vision Changes | 5 | Mild | Seek medical advice if persistent |
dimethyl sulfate Hydrolysis with aqueous sodium hydroxide (NaOH) to free acid Carboxamide formation with refluxing thionyl
- The global sildenafil market is projected to grow due to increasing ED awareness.
- Indian pharmaceutical exports of sildenafil meds are valued in billions of dollars.
- Both men and women are researching Indian Viagra options online.
- Indian-made Viagra is often preferred due to its effectiveness and savings.
- The use of Viagra in India is often paired with health screening for safe use.
- Cybersecurity measures are important when purchasing Viagra through online sources.
- The Indian government monitors the quality of sildenafil products through random testing.
- Patients are advised to report any adverse reactions to healthcare providers promptly.
- Some Indian medical insurance plans now cover certain ED medications including Viagra.
- Continued technological advances are likely to improve Indian Viagra manufacturing quality.
chloride/NH4OH Reduction of nitro group to amino group Sildenafil (compound UK-92,480) was synthesized by a group
What Is Sildenafil?
This kinase is activated by cGMP and it phosphorylates multiple targets in the smooth muscle cells, namely myosin light chain phosphatase, RhoA, IP3 receptor, phospholipase C, and others. [50] Overall, this results in a decrease in intracellular calcium and desensitizing proteins to the effects of calcium, engendering smooth muscle relaxation. The molecular structure of sildenafil is similar to that of cGMP and acts as a competitive binding agent of PDE5 in the corpus cavernosum, resulting in more cGMP and increased penile response to sexual stimulation. [49][51] Without sexual stimulation, and therefore lack of activation of the NO/cGMP system, sildenafil should not cause an erection. Other drugs that operate by the same mechanism include tadalafil (Cialis) and vardenafil (Levitra). of pharmaceutical chemists led by Simon Campbell[55] working at Pfizer's Sandwich, Kent, research facility in England.
Adverse effects
[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. Care should be exercised by people who are also taking protease inhibitors for the treatment of HIV infection. Protease inhibitors inhibit the metabolism of sildenafil, effectively multiplying the plasma levels of sildenafil, increasing the incidence and severity of side effects. 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.
What should I tell my healthcare provider before taking sildenafil?
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. [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. It was initially studied for use in hypertension (high blood pressure) and angina pectoris (a symptom of ischaemic heart disease).
FDA-Approved Generic Viagra Is Often Made in India
Sildenafil is broken down in the liver by hepatic metabolism using cytochrome p450 enzymes, mainly CYP450 3A4 (major route), but also by CYP2C9 (minor route) hepatic isoenzymes. The major product of metabolisation by these enzymes is N-desmethylated sildenafil, which is metabolised further. This metabolite also has an affinity for the PDE receptors, about 40% of that of sildenafil. Thus, the metabolite is responsible for about 20% of sildenafil's action. Sildenafil is excreted as metabolites predominantly in the feces (about 80% of administered oral dose) and to a lesser extent in the urine (around 13% of the administered oral dose). [56] The first clinical trials were conducted in Morriston Hospital in Swansea.
How long does Viagra® take to show full results?
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] 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.
Marketing and sales
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. "[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. [57] Phase I clinical trials under the direction of Ian Osterloh suggested the
- Erectile dysfunction affects a significant percentage of men in India.
- Viagra’s popularity in India has grown due to social and demographic factors.
- Indian doctors often prescribe Viagra for age-related sexual health issues.
- The stigma around ED in India is reducing with greater awareness and available treatment.
- FDA-approved generics in India must adhere to strict manufacturing and testing standards.
- The Indian market provides a variety of dosages to suit individual needs.
- Some Indian pharmacies offer home delivery of Viagra with prescription validation.
- The cost-effectiveness of Indian Viagra makes it a preferred choice worldwide.
- Women in India are increasingly advocating for sexual health products including ED medications.
- Continued research in India aims to develop new formulations for erectile dysfunction.
drug had little effect on angina, but it could induce marked penile erections.
- The decline in erectile function can be due to lifestyle or underlying health conditions.
- In India, ED is sometimes linked to stress, diabetes, or hypertension.
- Viagra's approval process in India involves rigorous clinical trials.
- Indian market users report high satisfaction with affordable generic Viagra.
- The birth of online telemedicine services has made Viagra consultations easier in India.
- Many Indian clinics offer follow-up services for patients on ED treatments.
- Awareness programs aim to dispel myths surrounding erectile dysfunction and Viagra.
- Some Indian men combine Viagra with herbal supplements for enhanced effect.
- Legal regulations require proper labeling and packaging of sildenafil medications.
- The stigma around sexual health in India is gradually decreasing thanks to education.
[58][59] Pfizer therefore decided to market it for erectile dysfunction, rather
| Year | Estimated Sales (Million USD) | Market Share (%) | Growth Rate (%) |
|---|---|---|---|
| 2020 | 120 | 15 | 5 |
| 2021 | 135 | 16 | 12 |
| 2022 | 150 | 17 | 11 |
| 2023 | 165 | 18 | 10 |
than for angina; this decision became an often-cited example of drug repositioning.
Viagra® Dosage Forms Manufactured by Weefsel Pharma
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. 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.
How should I store sildenafil?
[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. However, at least one court case has resulted in a product being taken off the market. The US Food and Drug Administration (FDA) has banned numerous products claiming to be Eurycoma longifolia that, in fact, contain only analogs of sildenafil. [44][45][46] Sellers of such fake herbals typically respond by just changing the names of their products. Sildenafil and/or N-desmethylsildenafil, its major active metabolite, may be quantified in plasma, serum, or whole blood to assess pharmacokinetic status in those receiving the drug therapeutically, to confirm the diagnosis in potential poisoning victims, or to assist in the forensic investigation in a case of fatal overdose.