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. [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.
[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] sildenafil citrate 200mg price 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. [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. The primary indication of sildenafil is treatment of erectile dysfunction (inability to sustain a satisfactory erection to complete sexual intercourse).
| Product | Dosage | Quantity + Bonus | Price | |
|---|---|---|---|---|
| Viagra Generic | 150mg | 120 + 8 Pills | 177.58€ 169.12€ | |
| Kamagra Oral Jelly | 100mg | 21 Sachets | 95.92€ 91.35€ | |
| Kamagra Soft Tabs | 100mg | 12 Pills | 57.55€ 54.81€ | |
| Kamagra Soft Tabs | 100mg | 32 Pills | 120.11€ 114.39€ | |
| Viagra Generic | 150mg | 180 + 10 Pills | 236.46€ 225.20€ | |
| Viagra Generic | 25mg | 30 + 4 Pills | 47.97€ 45.69€ | |
| Viagra Generic | 100mg | 270 + 10 Pills | 270.47€ 257.59€ | |
| Viagra Generic | 25mg | 20 Pills | 37.74€ 35.94€ | |
| Kamagra | 100mg | 60 + 4 Pills | 201.34€ 191.75€ | |
| Kamagra Soft Tabs | 100mg | 180 + 8 Pills | 425.45€ 405.19€ |
Its use is now one of the standard treatments for erectile dysfunction, including for males with sildenafil 25mg tablets 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. 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.
| Channel | Description | Typical Customers | Delivery Time | Legal Status |
|---|---|---|---|---|
| Licensed Pharmacies | Retail outlets with appropriate licenses | General public, prescriptions | Same day to 3 days | Legal |
| Online Pharmacies | Websites licensed under Canadian law | Tech-savvy customers | 1-5 days | Legal if licensed |
| International Suppliers | Importers sourcing from abroad | Bulk buyers, clinics | 1-4 weeks | Varies |
| Wholesale Distributors | Supply chain for pharmacies and clinics | Pharmacists, clinics | 1-2 days | Legal with license |
| Direct from Manufacturers | Authorized direct purchase options | Healthcare providers, pharmacies | Varies | Legal |
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.
In some cases, generic tadalafil from Canadian or international sources can drop below $1 per tablet when purchased in larger quantities. Site is transparent about where medication comes from, how prescriptions are handled, how long shipping takes, and what kind of support is available tends to inspire more confidence than a site focused only on discount language. This is a very different pathway from buying from a site that simply offers medication without any review process at all. From a pricing perspective, generic tadalafil tends to be one of the more attractive online options because the per-tablet cost can be relatively low, especially in larger quantities. Bulk discounts, multi-month ordering, and subscription-style arrangements can further reduce the average cost per dose.
For tadalafil specifically, online pharmacy demand tends to center sildenafil oral jelly 100 mg on two patterns of use: daily low-dose therapy and as-needed dosing. This is one reason Cialis and generic tadalafil remain popular. Daily tadalafil, usually in the 2.5 mg to 5 mg range, is often marketed around convenience and spontaneity. A patient using daily tadalafil may benefit from larger refill quantities that reduce the average monthly cost. These are practical decisions, and in a better-quality system they are discussed as part of the prescribing process rather than left entirely to the buyer.
As-needed tadalafil, more often in the 10 mg to 20 mg range, is commonly chosen by men who use treatment less frequently and want to limit the total number of tablets they purchase. A patient using medication intermittently may spend less overall with as-needed sildenafil or tadalafil. A patient who wants a longer window of action often prefers tadalafil over sildenafil, and that preference shapes how online pharmacy listings are presented. This is part of the reason many U.S. buyers compare online Cialis pricing so aggressively. Patients thus taking the drug may experience colorvision abnormalities. Some complained of blurriness and loss of peripheral vision.
Sildenafil has been on the market long enough that many patients are already familiar with it, and its generic availability has pushed pricing down in many international channels. Generic sildenafil is widely sold through Canadian pharmacy platforms and remains a common option for men who prefer shorter-acting treatment. Generic manufacturing at scale, particularly in India, has expanded access and reduced cost. Just as with tadalafil, international production is one of the main reasons online sildenafil prices can look relatively low. Because sildenafil is often used on an as-needed basis, some buyers focus less on the monthly average cost and more on cost per order.
For example, a patient who uses treatment intermittently may find it easier to purchase smaller batches of generic sildenafil, while someone using medication more regularly may compare larger packages to bring down the per-tablet price. 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 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). 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. [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.
| Aspect | Details | Impact on Consumers | Regulations in Canada |
|---|---|---|---|
| Import Regulations | Must adhere to Health Canada import rules | Ensures safety and quality | Strict control with licenses |
| Prescription Requirements | Mandatory prescription for purchase | Prevents misuse | Mandatory in pharmacies |
| Online Purchase Laws | Varies by province, some restrictions | Limits illegal sales | Crackdown on unregulated sites |
| Customs Clearance | Vigilant screening for pharmaceuticals | Delays or seizures | Inspected at border |
| Pharmacovigilance | Monitoring adverse effects | Enhances public safety | Mandatory reporting |
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.
The generic alternative is not manufactured by the company that makes the brand product. The content on this website is provided by a third-party source. Canadianpharmacyking cannot guarantee its medical accuracy, effectiveness, or reliability. This site is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with any medical questions or concerns.
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Canadian Pharmacy advertise both brand-name and generic versions of Cialis and Viagra, and they often present pricing that looks far more competitive than what patients are used to seeing at local U.S. pharmacies. My Canadian pharmacy offer a broad range of erectile dysfunction treatment options, care more about a specific brand, dosage flexibility, or a delivery process that feels discreet and predictable. My Canadian pharmacy have become a popular option for buyers comparing Cialis and Viagra prices online, particularly when generic versions are available Pricing through Canadian pharmacies is often 30–60% lower than U.S. retail, depending on dosage and supplier verification.