Sildenafil is the active ingredient that originally became known as Viagra – the first medication specifically developed for the treatment of erectile dysfunction in men. Sildenafil has been on the international market since 1998 and is the most widely prescribed medication for erection problems worldwide. On this page, you will find a clear overview of the various sildenafil products, dosages, and forms of administration, so that you can make an informed choice.
Sildenafil is a phosphodiesterase-5 inhibitor (PDE-5 inhibitor). That sounds complicated, but the mechanism of action is actually quite logical: sildenafil inhibits the enzyme PDE-5, which normally breaks down the substance cGMP in the blood vessels of the penis. Due to this inhibition, more cGMP remains available, the blood vessels relax, and blood flow to the penis increases. Sildenafil increases blood flow to the penis during sexual stimulation – without sexual stimulation, nothing happens. Therefore, sildenafil only works when you are sexually aroused.
In addition to erectile dysfunction, sildenafil also has an approved use in pulmonary arterial hypertension (PAH), a serious lung disease. In PAH, sildenafil is used in a very different dosing regimen (20 mg three times daily) and exclusively under strict medical supervision. This article focuses on the use of sildenafil for sexual dysfunction and erectile problems.
There are various forms and brand names of sildenafil, with different dosages and forms of administration. Whether you choose an original brand product or a generic variant, the active ingredient always contains sildenafil (citrate). Below, you can read about the different types available and what the differences mean.
The best-known brand product is Viagra from Pfizer, which was the first to enter the market in 1998. For pulmonary arterial hypertension, there is the brand Revatio, also from Pfizer. Since the patent on Viagra expired, countless generic variants are available that contain the same active ingredient and must meet the same bioequivalence requirements.
The most important difference? Generic sildenafil can be cheaper than brand-name drugs, while the effect is essentially the same. Differences lie mainly in appearance, excipients, taste, and price. For men who use sildenafil regularly, the price advantage of generics over brand-name Viagra is often a decisive reason.
Kamagra is one of the best-known generic products containing sildenafil and is offered in dosages similar to Viagra – usually 50 or 100 mg. It is intended for the same indication: erectile dysfunction. On Kamagrabestellen.eu, you will find various variants, including sildenafil tablets, Kamagra chewable tablets , effervescent tablets, and oral gel.
These products are offered outside the regular pharmacy circuit. This means a lower price point and more convenience, but also that you, as a user, bear personal responsibility for safe use. Check the reliability of the webshop before purchasing sildenafil – reliable providers always require a medical questionnaire to be completed.
Please note: injectable forms and specific high doses of sildenafil are intended exclusively for pulmonary arterial hypertension and are only used under strict medical supervision.
When choosing a sildenafil product, the brand name is not the only factor that matters. Dosage, onset time, safety, and the origin of the product are at least as important. Below, you can read what specifically you should look out for.
Sildenafil is available in dosages of 25 mg, 50 mg, and 100 mg. The recommended starting dose for most men is 50 mg. For milder symptoms or increased sensitivity (for example, in the elderly, or in cases of liver or kidney problems), 25 mg may already be sufficient . Only in the event of insufficient effect and good tolerability should you consider increasing to 100 mg.
Never take more than one dose per 24 hours. Stacking doses is dangerous and increases the risk of serious side effects, such as a severe drop in blood pressure.
The effect of sildenafil begins within 30 to 60 minutes after ingestion. On an empty stomach, the effect may be noticeable after approximately 25 minutes. Sildenafil remains active for an average of four hours after ingestion, although the effect gradually diminishes after 2–4 hours. In some men, some effect is noticeable for up to 5 hours.
Important: a high-fat meal can delay absorption by about an hour. Therefore, preferably take sildenafil on an empty or light stomach. And remember: sexual stimulation is always necessary. Sildenafil blocks the enzyme PDE-5, which allows erections to last longer – but it does not cause a spontaneous erection.
Sildenafil can have dangerous interactions with nitrates. Therefore, never use sildenafil together with nitrates (such as nitro spray, isosorbide dinitrate, or poppers), as this can lead to a life-threatening drop in blood pressure. Caution is also advised in cases of severe cardiovascular disease, high blood pressure, a recent myocardial infarction or stroke, severe liver or kidney disease, and in men with a blood pressure lower than 90/50 mmHg. Furthermore, erectile dysfunction can be an early sign of heart disease – consult your doctor or pharmacist if in doubt.
Common side effects include headache, flushing, dizziness, nasal congestion, and stomach upset, sometimes visual disturbances (bluish haze or light sensitivity). These symptoms are usually mild and temporary.
Alarm symptoms requiring immediate medical attention:
Sildenafil can temporarily lower blood pressure. When using other medications (such as alpha-blockers for prostate problems or CYP3A4 inhibitors ), the effects of sildenafil may be enhanced. Always consult the package leaflet and discuss your medication with a doctor or pharmacist, even if you purchase it outside of a regular pharmacy.
Sildenafil is available by prescription only in the Netherlands. A valid prescription is required to purchase sildenafil from a regular pharmacy. Many products, including sildenafil in the form of Kamagra, are ordered online outside this circuit. Ordering sildenafil online requires caution: websites offering sildenafil without a prescription are strictly speaking illegal, and online providers without a prescription often supply counterfeit products. Illegal medications can contain counterfeit or harmful substances, and the risk of health problems due to poor medication quality is high.
Telemedicine currently offers online doctor platforms where you can request Viagra via a medical questionnaire. Legal online pharmacies work with doctors registered with the BIG (Dutch register of healthcare professionals) and offer discreet packaging and delivery. At Kamagrabestellen.eu, the emphasis is on discreet delivery and transparent product information – however, it always remains the customer's responsibility to be aware of regulations and the importance of medical screening, as not everyone is suitable for sildenafil.
The choice of the right sildenafil product depends on your personal situation: your health, your sexual pattern, and your budget. Use the criteria below as a guideline:
Below is a practical guide for men who want to try sildenafil for the first time or again.
Sildenafil is not the best or safest choice for every man. There are alternatives both within and outside of medication.
The choice between these medications is often made based on lifestyle, side effect profile, and personal experience – it is best to discuss this with a doctor or pharmacist.
Lifestyle adjustments have a proven impact on erectile dysfunction: quitting smoking, reducing alcohol consumption, losing weight, and exercising more improve blood circulation and overall health. Psychological factors—stress, relationship problems, fear of failure—often play a role as well. A sexologist or psychologist can help if anxiety or insecurity predominates. Mechanical aids such as a penis pump or rings are possible additional options when medication is ineffective or undesirable.
Below, we answer the questions most frequently asked by Dutch and Belgian users, with concrete and concise answers.
The noticeable effect usually lasts 4 to 5 hours, although traces of the medication may remain in the blood for longer. During this period of action, you do not have a continuous erection – the erection occurs during sexual stimulation and disappears again after orgasm. Sexual stimulation therefore remains necessary at all times.
Moderate alcohol consumption (1–2 glasses) is usually not a problem. Drinking larger amounts of alcohol can impair the effectiveness of sildenafil, cause a further drop in blood pressure, and actually worsen erectile dysfunction. When using it for the first few times, it is best to test with little to no alcohol to see how your body reacts.
Sildenafil is not physically addictive. However, psychological dependence can develop if someone believes they cannot have sex without the pill. Try to have sex without the medication occasionally if possible, and consult a professional if anxiety or insecurity plays a role.
There are regimens in which sildenafil or another agent such as tadalafil is used daily, for example, for long-term use of erectile dysfunction medication . This should always be done under medical supervision. For most users, occasional use is the safest approach – if there is a need for daily use, consult a doctor first.
Watch out for these warning signs:
For medical safety, online medicines must be ordered through registered pharmacies. Kamagrabestellen.eu focuses on discreet yet transparent communication regarding products – customers can always ask questions about origin and packaging.
Sildenafil is a proven and widely used medication for erectile dysfunction, provided it is used responsibly. At Kamagrabestellen.eu, you benefit from fast shipping within the Netherlands and the EU, discreet packaging, and various payment options including bank transfer, PayPal, and Sofort.
Ordering is simple: choose your product and dosage, place your order, and receive your package discreetly at home. View the full collection of sildenafil-containing products – from Kamagra tablets and chewable tablets to oral gel – and compare consciously based on dosage, form of administration, and price. This way, you will find the sildenafil product that suits your situation.
