Top level a panoramic view of the main points and principal information
Sildenafil is the main active ingredient, functioning as a PDE5 inhibitor.
Indication: licensed for the treatment of erectile dysfunction (ED) in adult men.
Common strengths: tablets commonly come in 25 mg, 50 mg and 100 mg strengths; over-the-counter pharmacy option in the UK is typically 50 mg as Viagra Connect.
Typical timeline: many men notice effects within 30 to 60 minutes; the usual effectiveness window is around 4 to 6 hours for sildenafil-containing products.
- Only for use by adults aged 18 and over.
- Sildenafil enhances blood flow to the penis in response to sexual stimulation; it does not create sexual desire on its own.
- Products labelled as Kamagra found online are often unlicensed in the UK and pose safety and legal risks; see the law related section for more detail: the legal status and supply rules in the UK.
How it functions step by step
Sildenafil blocks the PDE5 enzyme in penile tissue, which helps preserve cyclic GMP after sexual stimulation. The result is improved blood inflow to the corpora cavernosa, supporting the development and maintenance of an erection when there is adequate sexual arousal. It is not an aphrodisiac and is ineffective without stimulation.
Dosage and directions
Carry out the instructions your prescriber or pharmacist provides. A commonly prescribed starting dose for many men is 50 mg taken when required, approximately one hour before sexual activity. Dose adjustment up or down (for example, to 25 mg or 100 mg) depends on effectiveness and tolerability.
- Do not take more than one dose in a 24 hour interval.
- Taking sildenafil with a large, high-fat meal can slow onset.
- If you are unsure of the correct dose, discuss options with a clinician before changing your regimen.
Never combine sildenafil with other PDE5 inhibitors or ED medicines on the same day unless specifically instructed by a healthcare professional.
Pre use instructions
Tell your clinician about any of the following conditions before taking sildenafil:
- Known allergies to medicines or tablet ingredients
- Heart conditions (heart failure, unstable angina, recent heart attack or stroke), or an irregular heartbeat
- Severe low or high blood pressure
- Eye problems including recent vision changes or a history of non-arteritic anterior ischemic optic neuropathy
- Blood disorders such as sickle cell disease or leukemia
- Anatomical deformation of the penis or conditions that increase the risk of priapism
- Moderate to severe liver or kidney impairment
- Current cancer treatment
Advice to minimise post use effects:
- Stand up slowly from sitting to reduce dizziness.
- Limit alcohol, as it can reduce effectiveness and increase adverse events.
- Provide a complete list of all other medicines, herbal products and supplements to your pharmacist or prescriber.
Contraclues indicating
- Hypersensitivity to sildenafil or any component of the tablet.
- Concurrent use of nitrates or nitric oxide donors in any form due to the risk of severe and near term potentially life-threatening drops in blood pressure.
- Not indicated for use in individuals under 18 years of age.
Possible undesirable effects
Most unwelcome ripple effects are mild to moderate and pass after a short time. Commonly reported effects include:
- Pulsating head pain with red cheeks
- The feeling of dizziness or lightheadedness
- Gastrointestinal upset such as indigestion, nausea or diarrhea
- Chronic nasal congestion
Rare, but serious. events may include sudden vision or hearing changes, chest pain, fainting, severe allergic reactions, and priapism (an erection lasting longer than four hours). Call emergency services for sudden severe symptoms severe symptoms or an erection lasting more than four hours.
Salient medication engagement and communication risks
Do not take sildenafil with any product that contains nitrates or nitric oxide donors. Sildenafil is metabolised primarily via CYP3A4, so the act of interactions among teammates fuel progress. with inhibitors or inducers of this enzyme can change sildenafil levels.
Examples of medicines that can interact include (not exhaustive):
- Nitrates and nitric oxide donors such as nitroglycerin in any formulation
- Certain alpha-blockers that lower blood pressure, including doxazosin, terazosin and prazosin
- Protease inhibitors and other antiretrovirals used in HIV care
- Azole antifungals like ketoconazole and itraconazole (CYP3A4 inhibitors)
- Macrolide antibiotics such as erythromycin and clarithromycin
- Strong enzyme inducers including rifampicin and certain anticonvulsants
Always disclose all prescription and non-prescription medicines to your healthcare provider before starting sildenafil.
Information on a skipped a dose
Sildenafil for erectile dysfunction is generally taken as needed rather than on a fixed schedule. Therefore, the usual concept of a missed daily dose does not apply. Take the medication when required, following the maximum dosing rules described above.
Overdose tragedy intervention actions
Symptoms of an non-fatal overdose may include severe dizziness, fainting, chest pain, severe nausea, irregular heartbeat or prolonged erection. If you think an non-fatal overdose has occurred, call emergency services or head to the closest emergency department immediately.
Storage safety guidance
- Keep tablets in their original packaging or container.
- Store at room temperature away from moisture and direct sunlight.
- Keep it out of sight and out of reach of children and pets at all times.
Pricing benchmarking alongside backup options in the UK
Licensed ancillary choices to unregulated online products are available in the UK. Prices depend on brand, strength, pack size and whether purchased privately or via the NHS. The ranges below are approximate and subject to change.
- Viagra Connect (sildenafil 50 mg, pharmacy medicine): typically about 19 to 25 GBP for 4 tablets, 35 to 45 GBP for 8 tablets. Pharmacist consultation required.
- Generic sildenafil (prescription only): commonly around 0.50 to 2.00 GBP per 50 mg tablet when obtained privately; NHS charges depend on eligibility.
- Tadalafil (Cialis) 10 mg or 20 mg: private retail prices often range around 2 to 8 GBP per tablet depending on strength and supplier; tadalafil may be used as once-daily or as-needed and has a longer duration of action.
- Vardenafil (Levitra) and avanafil (Spedra): private prices typically vary between about 2 and 10 GBP per tablet depending on strength and brand.
Price and characteristic comparison highlights:
- Onset: avanafil and sildenafil often act within 30 to 60 minutes; vardenafil is similar; tadalafil may take 30 to 120 minutes.
- Duration: tadalafil has the longest duration (up to 36 hours in some cases); sildenafil and vardenafil generally last 4 to 6 hours; avanafil often around 6 hours.
- Food the process of interactions are the heartbeat of social platforms.: large, fatty meals can delay the onset of sildenafil and vardenafil more than avanafil or tadalafil.
Products advertised online as Kamagra are not authorised in the UK. While these items may appear cheaper (for example 1 to 3 GBP per tablet in some adverts), they may be counterfeit, contain incorrect or harmful ingredients, paired with their sale is unlawful in the UK. For safety and legal compliance use a GPhC-registered pharmacy and licensed products.
The legal framework and supply rules in the UK
- Kamagra-branded products commonly sold online are not licensed by the Medicines and Healthcare products Regulatory Agency (MHRA) for sale in the UK.
- Licensed sildenafil is available in the UK as a Prescription Only Medicine (all strengths) and as a pharmacy (P) medicine in the form of Viagra Connect 50 mg for men aged 18 and over.
- Importation of unlicensed ED medicines from abroad can result in seizure by UK Border Force or MHRA; import does not make an unlicensed medicine lawful.
- Buy only from GPhC-registered pharmacies; legitimate online services should state their registration and clinical oversight.
- If in doubt about the legality or safety of a product, consult a pharmacist or the MHRA website for tips and professional guidance.
Appropriate for sport use
Sildenafil is not currently on the World Anti-Doping Agency prohibited list. Nevertheless, athletes should verify the rules of their sporting federation and consult medical staff before using any medicine. Sildenafil is not a performance-enhancing drug for training purposes and should be used only for approved medical markers pointing to.
Inquiries frequently asked
Is it okay to mix alcohol with sildenafil?
Small amounts of alcohol are unlikely to cause harm, but alcohol can increase the likelihood of dizziness, reduce blood pressure and impair erectile response. Limiting or avoiding alcohol around the time you take sildenafil is recommended.
What if sildenafil does not work the first time I try it?
Many men need to try sildenafil on several occasions before judging its effectiveness. Ensure adequate sexual stimulation, avoid heavy meals close to dosing and discuss dose adjustments or nonconventional medicines with your clinician if response is unsatisfactory.
Can I take sildenafil together with other ED medicines?
No. Please do not fuse. sildenafil with other PDE5 inhibitors or ED therapies on the same day unless a prescriber has instructed you to do so.
Are Kamagra and Viagra the same?
While some Kamagra products claim to contain sildenafil, the key difference is licensing and regulatory oversight. Viagra and licensed generic sildenafil sold in the UK meet MHRA quality standards. Kamagra-branded products sold online are typically unlicensed in the UK and may be unsafe or illegal.
For more answers, see the section on other course options and a price comparison study or speak to a pharmacist.
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