"Yes, There Is a Way to Get Generic Viagra". Archived from the original on 2 May 2016. "Pfizer Wins Viagra Patent Infringement Case Against Teva Pharmaceuticals".
- Sildenafil is only one treatment option for erectile dysfunction.
- Alternatives include other PDE5 inhibitors like tadalafil (Cialis).
- Non-pharmaceutical options include vacuum devices, counseling, or implants.
- Addressing underlying causes like diabetes or stress is important.
- Lifestyle changes (diet, exercise, quitting smoking) can improve ED.
- A urologist or sexual health specialist can provide comprehensive care.
- Treatment plans should be personalized.
Archived from the original on 11 January 2015. ^ "Pfizer Completes Transaction to Combine Its Upjohn Business with Mylan". Retrieved 17 June 2024 – via Business Wire. Archived from the original on 17 June 2024. "Viagra patent expires in June, says Brazilian court". Archived from the original on 17 April 2012. ^ "Revatio patent ruled invalid for lack of sound prediction and obviousness". Archived from the original on 3 March 2016. {{cite web}}: CS1 maint: deprecated archival service (link) ^ Teva Canada Ltd.
- Sildenafil is metabolized primarily by the liver enzyme CYP3A4.
- Drugs that inhibit this enzyme can increase sildenafil levels and side effects.
- Examples include some antibiotics, antifungals, and HIV medications.
- Drugs that induce CYP3A4 can decrease sildenafil's effectiveness.
- Always provide your doctor with a complete list of your medications.
- This includes over-the-counter drugs, herbs, and supplements.
- Pharmacists perform interaction checks before dispensing.
v. Pfizer Canada Inc., 2012 SCC 60 at par. "Supreme Court ruling could lead to cheaper versions of Viagra". Archived from the original on 10 March 2013. "Canadian Supreme court rules Viagra patent invalid".
Where to buy viagra online in canada
Archived from the original on 6 December 2017. "Why Pfizer Is About to Slash Viagra's Price in Half". Archived from the original on 7 December 2017. "Pfizer to sildenafil pills lose patent of drug Viagra, Indian companies gear up with copycat versions: Pfizer's patent for the formulation of Viagra, used to treat impotence in men, ends in the US in 2020". Archived from the original on 17 April 2021.
Storage Instructions
^ "Set to conquer US, Indian 'Viagras' may give Pfizer a hard Time". Archived from the original on 22 December 2020. ^ a b "Pfizer Settles Viagra® Patent Litigation With Teva". "Lockout Supplements Issues Voluntary Nationwide Recall of Boner Bears Chocolate Syrup Due to Undeclared Sildenafil". Archived from the original on 19 November 2016. Archived from the original on 11 November 2012. ^ "Viagra patent tossed out by Supreme Court: Decision allows generic versions of drug to be produced". Archived from the original on 18 September 2013. ^ "Pfizer Canada drops Viagra price after generic versions get Supreme Court green light".
| Product | Dosage | Quantity + Bonus | Price | |
|---|---|---|---|---|
| Viagra Generic | 100mg | 90 + 6 Pills | 129.02€ 122.88€ | |
| Viagra Generic | 200mg | 360 + 10 Pills | 481.98€ 459.03€ | |
| Kamagra Polo | 100mg | 272 + 12 Pills | 622.94€ 593.28€ | |
| Viagra Generic | 150mg | 180 + 10 Pills | 236.46€ 225.20€ | |
| Viagra Generic | 50mg | 360 + 10 Pills | 225.33€ 214.60€ | |
| Kamagra Soft Tabs | 100mg | 20 Pills | 79.79€ 75.99€ | |
| Kamagra | 100mg | 32 Pills | 121.24€ 115.47€ | |
| Viagra Generic | 50mg | 90 + 6 Pills | 107.37€ 102.26€ | |
| Viagra Generic | 25mg | 10 Pills | 25.19€ 23.99€ | |
| Kamagra Soft Tabs | 100mg | 120 + 6 Pills | 311.78€ 296.93€ |
Archived from the original on 30 November 2012.
Warnings & Precautions
^ "FDA Warns Consumers About Dangerous Ingredients in "Dietary Supplements" Promoted for Sexual Enhancement". Archived from the original on 18 January 2017. ^ "Hidden Risks of Erectile Dysfunction 'Treatments' Sold Online". Archived from the original on 23 April 2019. ^ R.
Get your treatment plan
Baselt, Disposition of Toxic Drugs and Chemicals in Man, 9th edition, Biomedical Publications, Seal Beach, CA, 2011, pp. Archived from the original (PDF) on 10 September 2011. "Structure of the catalytic domain of human phosphodiesterase 5 with bound drug molecules". ^ a b Webb DJ, Freestone S, Allen MJ, Muirhead GJ (March 1999). "Sildenafil citrate and blood-pressure-lowering drugs: results of drug interaction studies with an organic nitrate and a calcium antagonist". Archived from the original on 27 December 2013.
- Individuals with certain pre-existing conditions should avoid sildenafil.
- These include severe heart disease, recent stroke, or heart attack.
- Low blood pressure or uncontrolled high blood pressure are concerns.
- Retinitis pigmentosa or other severe eye disorders increase risk.
- Severe liver or kidney disease affects how the body processes the drug.
- A doctor must evaluate risks versus benefits for each patient.
- Never use sildenafil that was prescribed for someone else.
"In rare move, Pfizer asks Supreme Court to reconsider ruling that killed Viagra patent". Archived from the original on 5 February 2013. "The Supreme Court of Canada holds Pfizer's Viagra patent invalid". Archived from the original on 20 May 2013. ^ "Actavis Launches Generic Viagra in Europe as Patents Expire".
Patient Forms
^ Goldstein I, Lue TF, Padma-Nathan H, Rosen RC, Steers WD, Wicker PA (May 1998). "Oral sildenafil in the treatment of erectile dysfunction. Archived from the original on 14 January 2012. "Onset and duration of action of sildenafil for the treatment of erectile dysfunction". ^ "Scientist who developed Viagra receives knighthood in New Year's Honours".
Raynaud's phenomenon
Archived from the original on 14 January 2023. "Sildenafil: from angina to erectile dysfunction to pulmonary hypertension and beyond". Archived from the original on 26 September 2008. Our clinicians regularly offer patients the opportunity to take part in trials of new drugs and treatments. Morriston Hospital in Swansea, was the first in the world to trial Viagra! Archived from the original on 29 October 2013. "What Will Happen When Viagra Goes Generic?". Archived from the original on 23 April 2011. ^ "Is Viagra about to lose its pulling power in the UK?". Archived from the original on 30 October 2013. Archived from the original on 22 August 2009. Archived from the original on 25 June 2007. "Viagra from the pharmacist: insight from reclassification in New Zealand". Archived from the original on 17 May 2021.
What is Sildenafil used for?
Archived from the original on 9 January 2009. Archived from the original on 22 February 2021. ^ a b "Viagra now available over the counter without prescription in the UK". Archived from the original on 26 March 2021. Archived from the original on 8 December 2013.
Serious Side Effects
"The coming generics threat to Pfizer's Viagra brand just got scarier". Archived from the original on 9 September 2017. ^ "Viagra to go generic in 2017 according to Pfizer agreement". Archived from the original on 1 December 2017. "Sex, Drugs and That Little Blue Pill". ^ "Generic Viagra developers queue up, but may have to wait". Archived from the original on over the counter drugs containing sildenafil 28 December 2021.
- PDE5 inhibitors like sildenafil can lower blood pressure.
- This effect is increased when combined with nitrates or alpha-blockers.
- Blood pressure should be monitored, especially when starting treatment.
- Patients with heart conditions need careful evaluation before use.
- Sexual activity itself poses a cardiac risk for some individuals.
- A doctor may recommend stress testing for at-risk patients.
- Report any fainting or severe dizziness to a doctor immediately.
^ "Approved Viagra copies flood drugstores in Korea". ^ "Viagra prescriptions almost triple in a decade". Archived from the original on 1 July 2024. ^ "MHRA reclassifies Viagra Connect tablets to a Pharmacy medicine". ^ "Viagra to be available without prescription in UK". This section identifies the active ingredient in Viagra® and lists comparable pharmaceutical brands available in Canada. Viagra® is a brand-name medication containing the active ingredient sildenafil. In the Canadian pharmaceutical landscape, it belongs to a class of drugs that manage blood flow through specific enzymatic pathways. Other competing Canadian brands that utilize similar pharmacological mechanisms include Cialis® (tadalafil), Levitra® (vardenafil), and Staxyn® (vardenafil). Another sildenafil-based brand, Revatio®, is also available but is often dispensed in different strengths for distinct clinical purposes.
| Brand Name | Manufacturer | Dosage Forms | Price Range (CAD) |
|---|---|---|---|
| Viagra | Pfizer | Tablets 25 mg, 50 mg, 100 mg | 20–60 per tablet |
| Sildenafil Accord | Accord Healthcare | Tablets 50 mg | 15–45 per tablet |
| Sildenafil Sandoz | Sandoz | Tablets 20 mg, 50 mg | 18–50 per tablet |
| Kamagra | Ajanta Pharma (imported) | Tablets 100 mg | Varies, often unlicensed |
In Canada, this medication is primarily available as oral tablets in three standardized strengths. Viagra® is produced as blue, film-coated, diamond-shaped tablets.
Dosage Instructions of Viagra®
"Counterfeit Viagra, Cialis, Levitra: The Ultimate Guide". Archived from the original on 10 January 2017. "Online pharmacies suspected of counterfeit drug sales". ^ "Erectile Dysfunction Medication the Most Seized Drug During Global Crackdown, Interpol Says". ^ "Global illicit medicines targeted by INTERPOL operation".
Drug Interactions
Archived from the original on 10 December 2023. ^ "Israeli-made AI exposes international fake Viagra network". ^ "Counterfeit Viagra Pills, Footwear, Belts, Car Emblems and Headphones Worth over $32 Million Seized at the LA/Long Beach Seaport U.S. Customs and Border Protection". Archived from the original on 12 October 2013. The available formats in Canadian pharmacies include: Viagra® works by protecting specific molecules that allow smooth muscles to relax and increase blood flow. At a biological level, sildenafil is a selective inhibitor of the PDE5 enzyme. Under normal conditions, this enzyme breaks down a substance called cyclic guanosine monophosphate (cGMP). By blocking PDE5, Viagra® allows cGMP levels to remain elevated. This leads to the relaxation of smooth muscles in the walls of blood vessels, which facilitates increased blood flow to specific areas of the body. Usage involves oral administration according to strict timing and safety guidelines provided by a healthcare professional. Viagra® is taken orally, generally with or without food. Because its absorption can be delayed by high-fat meals, timing is an essential pharmaceutical consideration. It is typically administered as a single dose when needed, and it is strictly recommended that users do not exceed one dose within a 24-hour period. Dosage adjustments are made based on individual physiological responses and safety profiles. Proper storage ensures the chemical stability and shelf-life of the sildenafil citrate compound.
| Drug Class | Common Drugs | Effect | Notes |
|---|---|---|---|
| Nitrates | Nitroglycerin | Severe hypotension | Contraindicated |
| Alpha-blockers | Tamsulosin, Doxazosin | Increased hypotensive effect | Use with caution, start at lowest dose |
| CYP3A4 inhibitors | Ketoconazole, Itraconazole | Increased sildenafil levels | May increase side effect risk |
| Other ED medications | Tadalafil, Vardenafil | Enhanced effect | Risk of hypotension |
Temperature: Store at room temperature between 15°C and 30°C. Environment: Keep the tablets in a dry place away from moisture (avoid bathroom cabinets).
| Common Side Effects | Less Common Side Effects | Serious Side Effects |
|---|---|---|
| Headache | Flushing | Sudden vision loss |
| Dyspepsia (Indigestion) | Nasal congestion | Priapism (prolonged erection) |
| Dizziness | Muscle pain | Allergic reactions |
| Blurred vision | Gastrointestinal disturbances | Heart attack (rare) |
Safety: Ensure the medication is kept in its original packaging and out of reach of children. Users may experience common physiological shifts or rare, more serious reactions requiring immediate clinical attention. Abnormal vision (such as a blue color tinge or blurred vision) Priapism: A prolonged and potentially painful physiological reaction lasting over four hours. Sudden Vision Loss: Rare reports of decreased or loss of vision in one or both eyes.
What is Viagra?
^ Boolell M, Allen MJ, Ballard SA, Gepi-Attee S, Muirhead GJ, Naylor AM, et al. "Sildenafil: an orally active type 5 cyclic GMP-specific phosphodiesterase inhibitor for the treatment of penile erectile dysfunction". "Sildenafil (Viagra), a potent and selective inhibitor of Type 5 cGMP phosphodiesterase with utility for the treatment of male erectile dysfunction". "Drug repositioning: identifying and developing new uses for existing drugs". Archived from the original on 22 April 2019.
Pulmonary hypertension
Archived from the original on 10 June 2019. "Health situation in former communist bloc is dire, says Unicef". Archived from the original on 1 November 2012. ^ Gurevich M, Cormier N, Leedham U, Brown-Bowers A (August 2018). Sexuopharmaceutical use by men as prevention and proficiency". Sudden Hearing Decrease: Sudden decrease or loss of hearing, sometimes accompanied by dizziness. Health Canada emphasizes strict precautions regarding cardiovascular health and specific pre-existing medical conditions. Before using Viagra®, it is vital to have a cardiovascular screening.
Are there Alternative Names for the Brand or Generic Viagra?
"Spreading the Word, but What Word is That? Viagra and Male Sexuality in Popular Culture". "A new view of women's sexual problems: Why new? Archived from the original on 3 January 2009. Archived from the original on 12 October 2008.
Regional issues
"Sales of Impotence Drugs Fall, Defying Expectations". Archived from the original on 11 October 2007. ^ "Pfizer Courting More Controversy with Viagra 'Advergaming'". Archived from the original on 19 December 2019. Archived canadian sildenafil citrate from the original on 6 May 2018. The medication can cause a temporary decrease in blood pressure.
