Manforce ( Sildenafil Citrate )

Buy Manforce (Sildenafil Citrate) without prescription in Canada

In our Canadian pharmacy, you can buy Manforce (Sildenafil Citrate) without a prescription, with delivery across Canada within 5‑14 days. Discreet and anonymous packaging.

Manforce (sildenafil citrate) is a well‑known oral treatment for erectile dysfunction (ED) in men. It belongs to the phosphodiesterase type 5 (PDE5) inhibitor class of medications. When combined with sexual stimulation, sildenafil works by relaxing the smooth muscles and widening the blood vessels in the penis, which increases blood flow and helps to produce and maintain a firm erection suitable for sexual activity.

Usual adult dose: The recommended dose is one 100 mg tablet taken orally with a glass of water, approximately 30 to 60 minutes before anticipated sexual activity. The maximum recommended dosing frequency is once per day. A high‑fat meal may delay the onset of action, so taking the tablet on an empty stomach or after a light meal is best. The tablet can be divided in half if a 50 mg dose is preferred and prescribed by a doctor.

Dosage form: Oral tablet containing 100 mg of sildenafil citrate.

Onset of action: The medication typically begins to work within 30 to 60 minutes after ingestion. Some men may notice an effect in as little as 15 to 20 minutes if taken on an empty stomach.

Duration of action: The ability to achieve an erection in response to sexual stimulation is maintained for up to 4 to 6 hours after taking a dose. Sildenafil does not cause a constant erection; arousal is still required.

Alcohol recommendation: Alcohol consumption should be limited or avoided while taking Manforce. Drinking alcohol can temporarily reduce the ability to get an erection and may increase the risk of side effects such as headache, dizziness, flushing, and a drop in blood pressure.

Most common side effects: Headache, facial flushing, indigestion, nasal congestion, dizziness, and visual changes (such as a blue tinge to vision, sensitivity to light, or blurred vision). These effects are usually mild and temporary. A prolonged and painful erection lasting more than 4 hours (priapism) is a rare but serious side effect requiring immediate medical attention.

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General Information about Manforce (Sildenafil Citrate)

• INN (International Nonproprietary Name): Sildenafil Citrate
• Brand names available in Canada: The brand name Manforce® is not approved or marketed in Canada. Sildenafil citrate is legally available in Canada as Viagra® (Pfizer Canada Inc.) and as generic sildenafil tablets from several manufacturers, including APO‑Sildenafil (Apotex Inc.), TEVA‑Sildenafil (Teva Canada Limited), Sandoz Sildenafil (Sandoz Canada Inc.), PMS‑Sildenafil (Pharmascience Inc.), and others. Manforce is an internationally sourced generic product obtained by our pharmacy through the international supply chain for personal importation.
• ATC code: G04BE03 (urologicals, drugs used in erectile dysfunction)
• Dosage forms and strengths: Oral tablets: 100 mg. (Sildenafil citrate tablets are also available in 25 mg, 50 mg, and 100 mg strengths in Canada under other brand and generic names.)
• Manufacturers in Canada: None. Manforce is manufactured internationally by Mankind Pharma Ltd. (India). Sildenafil citrate tablets sold in Canada are manufactured by Pfizer Canada Inc. and various generic companies. Our pharmacy obtains Manforce via the international supply chain for personal use.
• Registration status in Canada: Not marketed in Canada. Manforce has not been issued a Notice of Compliance by Health Canada and is not listed in the Drug Product Database. The active ingredient, sildenafil citrate, is approved in Canada only in the oral tablet form as Viagra and its approved generics.
• OTC / Rx classification: Prescription only (Rx). Sildenafil is a Schedule I drug in Canada and requires a valid prescription from a licensed Canadian healthcare professional. Our pharmacy fulfills this prescription for the internationally sourced product.

Mechanism of Action and Pharmacology

Sildenafil citrate is a potent and selective inhibitor of cyclic guanosine monophosphate (cGMP)‑specific phosphodiesterase type 5 (PDE5). During sexual stimulation, nitric oxide is released from nerve endings and endothelial cells in the corpus cavernosum of the penis. Nitric oxide activates the enzyme guanylate cyclase, which increases the intracellular concentration of cGMP. This leads to relaxation of the smooth muscle in the penile arteries and the corpus cavernosum, allowing blood to flow in and produce an erection. PDE5 normally breaks down cGMP, terminating the erectile response. By inhibiting PDE5, sildenafil allows cGMP to accumulate and persist, significantly enhancing and prolonging the erection in the presence of sexual stimulation. Sildenafil has no direct relaxant effect on isolated human corpus cavernosum smooth muscle without sexual stimulation.

Sildenafil is rapidly absorbed after oral administration, with peak plasma concentrations reached within 30 to 120 minutes (median 60 minutes) under fasting conditions. The absolute bioavailability of oral sildenafil is approximately 40%. Food, particularly a high‑fat meal, delays absorption and reduces peak concentration. Sildenafil is metabolized primarily by the cytochrome P450 isoenzyme CYP3A4 (major route) and CYP2C9 (minor route), to an active N‑desmethyl metabolite that possesses approximately 50% of the pharmacologic activity of the parent drug. The elimination half‑life of sildenafil and its active metabolite is approximately 4 hours. Sildenafil is excreted as metabolites predominantly in the faeces (80%) and to a lesser extent in the urine (13%).

Indications

• Treatment of erectile dysfunction (ED), which is the inability to achieve or maintain a penile erection sufficient for satisfactory sexual performance. Sildenafil is effective for ED of various aetiologies, including organic, psychogenic, and mixed causes. It is only active when there is adequate sexual stimulation.
• Not indicated for use in women or in children and adolescents under 18 years of age.

Important Warnings and Precautions

At‑risk groups

• Pregnancy and breastfeeding: Manforce is not indicated for use by women. There are no adequate and well‑controlled studies of sildenafil in pregnant or breastfeeding women.
• Paediatrics (< 18 years): Sildenafil is not approved for use in children or adolescents for the treatment of erectile dysfunction.
• Elderly: No dose adjustment is required based on age alone. However, elderly patients may be more sensitive to the vasodilatory effects of sildenafil, and the risk of orthostatic hypotension may be increased. A lower starting dose of 25 mg may be considered.
• Cardiovascular disease: Sexual activity carries a degree of cardiac risk for patients with pre‑existing cardiovascular disease. Sildenafil has vasodilatory properties and can cause mild and transient decreases in blood pressure. It is contraindicated in patients with severe cardiovascular disease, including unstable angina, severe heart failure, and recent myocardial infarction or stroke (within the last 6 months).
• Use with nitrates: Sildenafil potentiates the hypotensive effects of nitrates and nitric oxide donors (e.g., nitroglycerin, isosorbide mononitrate, amyl nitrate). Concomitant use is absolutely contraindicated and can lead to a life‑threatening drop in blood pressure. Patients must be counselled not to take Manforce with any form of nitrate medication.
• Use with guanylate cyclase stimulators: Concomitant use of sildenafil with riociguat (a stimulator of soluble guanylate cyclase) is contraindicated, as this can also cause severe hypotension.
• Priapism: Prolonged erection (longer than 4 hours) has been reported rarely with PDE5 inhibitors. This is a medical emergency that can lead to permanent penile tissue damage and impotence. Men who experience an erection lasting more than 4 hours should seek immediate medical attention.
• Vision loss: Non‑arteritic anterior ischaemic optic neuropathy (NAION), a cause of sudden vision loss, has been reported rarely in temporal association with PDE5 inhibitor use. The risk may be increased in patients with a small cup‑to‑disc ratio, those with hypertension or diabetes, and smokers. Men who experience sudden vision loss should stop taking the drug and seek immediate medical care.
• Hearing loss: Sudden decrease or loss of hearing has been reported. Patients should discontinue sildenafil and seek prompt medical attention if this occurs.
• Renal impairment: No dose adjustment is required in mild to moderate renal impairment. In patients with severe renal impairment (creatinine clearance < 30 mL/min), the use of sildenafil has not been adequately studied, and a lower starting dose of 25 mg should be considered.
• Hepatic impairment: The metabolism of sildenafil is reduced in patients with hepatic impairment (e.g., cirrhosis). A lower starting dose of 25 mg is recommended.
• Anatomical deformation of the penis: Use with caution in patients with anatomical deformation (e.g., Peyronie’s disease, angulation, cavernosal fibrosis) or conditions predisposing to priapism (e.g., sickle cell anaemia, multiple myeloma, leukaemia).
• Allergy: Do not take Manforce if you have a known hypersensitivity to sildenafil citrate or any of the tablet’s excipients.

Driving and alcohol

Sildenafil may cause dizziness, blurred vision, or altered colour perception. Patients should be aware of how they react to the medication before driving or operating heavy machinery. Alcohol consumption should be limited, as it may impair the ability to achieve an erection, lower blood pressure, and worsen the side effects of sildenafil such as headache and dizziness.

Dosage Instructions

• Standard adult dose: The recommended dose is one 100 mg tablet taken orally as needed, approximately 30 to 60 minutes before sexual activity. The maximum recommended dosing frequency is once daily. For patients who find the 100 mg dose too strong or who have risk factors for adverse effects, the tablet may be divided in half (50 mg) under the direction of a physician.
• Administration: Swallow the tablet whole with a glass of water, or split along the score line if a half‑dose is prescribed. Taking the tablet on an empty stomach or after a light meal will help it work faster. A high‑fat meal can significantly delay the onset of action.
• Maximum daily dose: Do not take more than one 100 mg tablet in a 24‑hour period.
• Missed dose: Manforce is taken as needed, not on a fixed daily schedule, so a missed dose is not applicable.

Side Effects and Contraindications

• Very common side effects (≥ 10%): Headache and flushing.
• Common side effects (1‑10%): Dyspepsia (indigestion), nasal congestion, dizziness, and visual disturbances (colour tinge, increased sensitivity to light, blurred vision).
• Less common but serious side effects: Priapism (a prolonged, painful erection lasting more than 4 hours), sudden vision loss in one or both eyes (NAION), sudden decrease or loss of hearing, and serious cardiovascular events (myocardial infarction, stroke, ventricular arrhythmia) occurring in temporal association with sexual activity and sildenafil use.
• Contraindications: Concomitant use of organic nitrates in any form, or nitric oxide donors (e.g., amyl nitrite). Concomitant use of riociguat (a guanylate cyclase stimulator). Known hypersensitivity to sildenafil citrate or any component of the product. Severe cardiovascular disease or conditions in which sexual activity is inadvisable. Recent myocardial infarction (within 6 months) or stroke. Severe hepatic impairment.

Drug Interactions

• Nitrates and nitric oxide donors — contraindicated: The co‑administration of sildenafil with any organic nitrate or nitrite (e.g., nitroglycerin, isosorbide mononitrate, isosorbide dinitrate, amyl nitrite) is absolutely contraindicated because it can cause profound hypotension that may result in fainting, shock, or even death.
• Guanylate cyclase stimulators — contraindicated: Riociguat (e.g., Adempas®) should not be co‑administered with sildenafil due to the risk of additive hypotensive effects.
• Alpha‑blockers: Concomitant use of sildenafil and alpha‑adrenergic blocking agents (e.g., doxazosin, tamsulosin, terazosin) may lead to additive vasodilation and symptomatic hypotension. Patients on alpha‑blockers should be stabilized on the lowest dose before starting sildenafil, and sildenafil should be initiated at a lower dose (e.g., 25 mg). The 100 mg strength of Manforce may be too high for patients on alpha‑blockers, and a lower starting dose is generally recommended.
• Potent CYP3A4 inhibitors: Drugs that inhibit CYP3A4, such as ritonavir, indinavir, saquinavir, ketoconazole, itraconazole, clarithromycin, and erythromycin, can increase plasma levels of sildenafil. A lower starting dose of sildenafil (e.g., 25 mg) should be used. Grapefruit juice, a moderate CYP3A4 inhibitor, may also increase sildenafil exposure.
• Antihypertensives: Sildenafil may produce additive blood‑pressure‑lowering effects when administered with antihypertensive medications. Most patients tolerate this combination without significant adverse effects; however, those with pre‑existing hypotension should be cautious.

Practical Advice

• Administration: Take one tablet about one hour before you plan to have sex. For a faster effect, take it on an empty stomach or after a light meal. Avoid a heavy, high‑fat meal beforehand, as this will delay its action. Do not take more than one tablet per day.
• Monitoring: No specific routine laboratory monitoring is required. However, men with underlying cardiovascular risk factors should have a medical evaluation before starting treatment for erectile dysfunction. If you experience chest pain during sexual activity, stop immediately and seek medical attention.
• Storage: Store at room temperature (15‑30 °C) in a dry place, protected from moisture and heat. Keep out of the reach and sight of children.
• Lifestyle: Sildenafil is a treatment for erectile dysfunction, not a cure. Addressing underlying causes—such as quitting smoking, reducing alcohol consumption, losing weight, and controlling diabetes and hypertension—can improve erectile function. Never share your medication, and do not take Manforce with other sildenafil‑containing products or any other PDE5 inhibitor (e.g., tadalafil, vardenafil).
• Emergency information: If you develop an erection that lasts longer than 4 hours or experience sudden vision loss, stop taking Manforce and go to the nearest emergency department immediately. If you need to be seen by a doctor for any reason, always tell them you are taking sildenafil, especially if you are admitted to hospital for chest pain.
• Disposal: Return unused or expired tablets to a pharmacy for safe disposal. Do not flush down the toilet or discard in household waste.

Alternative Medications

• Tadalafil (Cialis®): An oral PDE5 inhibitor with a longer duration of action (up to 36 hours), available as a tablet for daily or on‑demand use. In Canada, it is available as a brand name and generic. It is less affected by food intake.
• Vardenafil (Levitra®): Another PDE5 inhibitor, available as an oral tablet with a duration similar to sildenafil. A generic version is available. Levitra is also available in an orally disintegrating tablet formulation.
• Avanafil (Stendra®): A fast‑acting PDE5 inhibitor that can start working in as little as 15 minutes. It is available as a brand‑name prescription drug in Canada.
• Alprostadil (Caverject®): An injectable or intraurethral pellet that stimulates an erection directly by relaxing penile smooth muscle. It is used when oral PDE5 inhibitors are ineffective or contraindicated.
• Non‑pharmacological options: Vacuum erection devices (VEDs), penile implants, and psychological counselling for psychogenic ED are alternatives or adjuncts to drug therapy. Treating underlying cardiovascular risk factors is also a cornerstone of long‑term ED management.

Clinical Efficacy

Sildenafil citrate has been proven effective for the treatment of erectile dysfunction in numerous double‑blind, placebo‑controlled clinical trials. In fixed‑dose studies, a 100 mg dose improved the ability to achieve and maintain erections in approximately 82% of men, compared with 24% of men on placebo. The response rate is higher for those with psychogenic ED. A systematic review of multiple trials concluded that sildenafil is an effective and generally well‑tolerated first‑line therapy for erectile dysfunction, with a number needed to treat (NNT) of approximately 2. Side effects are generally mild and transient, with headache and flushing being the most frequent. Generic sildenafil, including internationally sourced products, is bioequivalent to the branded Viagra.

Important:

Manforce (sildenafil citrate) is a prescription medication that has not been approved for marketing by Health Canada. It should only be used under the supervision of a qualified healthcare professional. The most critical safety warning is that sildenafil must never be taken with any form of organic nitrate (e.g., nitroglycerin, isosorbide mononitrate, “poppers”) as this combination can cause a severe, sudden, and potentially fatal drop in blood pressure. If you experience chest pain or an erection lasting longer than 4 hours, stop using the medication and seek emergency medical attention immediately. Sexual activity carries a risk to the heart in patients with pre‑existing cardiovascular disease. This product is for adult men and is not intended for use by women or children. This information is not a substitute for professional medical advice, diagnosis, or treatment.

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