Viagra is a well-known medication for treating erectile dysfunction thanks to its active ingredient, Sildenafil. By acting on the smooth muscles of the penis, it promotes blood flow and helps achieve an erection. Effective in 75% of cases, it is taken 30 to 60 minutes before sexual intercourse and its effect lasts up to 5 hours. However, this medication is only available by prescription. This is due to its possible side effects, such as headaches, dizziness, or vision problems. More seriously, there are contraindications, especially in the case of heart problems or interactions with certain medications, such as vasodilators. Viagra should be taken with caution and under medical supervision, as it affects blood flow and can cause complications. Purchasing Viagra without a prescription on the internet is not only illegal but also dangerous. Indeed, counterfeits are circulating, containing harmful substances or incorrect dosages. Each year, millions of fake tablets are seized, and 40% of them involve Viagra and Cialis. Some contain dangerous products, heavy metals, or undeclared substances. Others, overdosed by up to 180%, increase the risk of serious side effects. To avoid these dangers, it is crucial to obtain Viagra through a prescription issued by a doctor, either in a physical consultation or online on accredited sites like Kano. This ensures that the medication is suitable for your condition and avoids the risks associated with fake products. Each case is unique and should be considered by a professional. In conclusion, although Viagra is an effective solution for erectile dysfunction, it must always be used under medical supervision to ensure your safety and health.

How to get Viagra®?

Dr. Sam Ward - Urologue et Andrologue

Medically reviewed by Dr. Sam Ward

Written by Notre équipe éditoriale

Last updated 6/4/2023 - 4 min read

Viagra® is undoubtedly the most well-known medication for treating erectile dysfunction. Since its market release in 1998, it has revolutionized the treatment of erectile dysfunction with its active ingredient, Sildenafil. However, while its effectiveness is well documented, purchasing this medication without a prescription on the internet poses numerous risks. Here is a complete guide to better understand how Viagra works, its side effects, and why it is essential to obtain it through a medical prescription.

How does Viagra work?

Viagra works by inhibiting a specific enzyme, phosphodiesterase type 5, present in the penis. This enzyme plays a role in regulating blood flow. When Viagra is taken, it allows the smooth muscles of the penis to relax, thus facilitating the influx of blood into the cavernous bodies and the shaft, which leads to an erection. However, the drug does not work alone: sensory stimulation is necessary to provoke an erection.

Viagra is usually taken 30 to 60 minutes before sexual intercourse and its effects can last up to 5 hours. For optimal results, it is advised to take it on an empty stomach, as food can delay its absorption. The dosage of Viagra depends on many factors: lifestyle, weight, medical history, etc. Therefore, it is essential to consult a doctor to get a suitable prescription.

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Why is Viagra only available by prescription?

Viagra, despite its effectiveness, is not without risk. Indeed, it acts directly on blood flow and can lead to various side effects. The most common include headaches, dizziness, vision disorders, facial flushing, digestive problems, and a stuffy nose. More rarely, it can cause discomfort, nosebleeds, hearing loss, palpitations, or even heart rhythm disorders.

Moreover, Viagra is contraindicated in several situations. It should not be used in case of serious cardiovascular problems, or with nitrate medications (especially used for heart diseases) and certain recreational substances like poppers, as this can cause a dangerous drop in blood pressure. It is also not recommended for people with a history of cerebrovascular accidents, liver failure, or those suffering from vision impairments.

For these reasons, Viagra can only be dispensed with a prescription. Only a doctor can assess if the treatment is suitable, and adjust the dosage according to your overall health condition.

The dangers of buying Viagra without a prescription

Buying Viagra without a prescription on the internet may seem tempting, especially when the embarrassment of discussing erectile dysfunction or the cost of a medical consultation are barriers. However, this practice carries significant risks. Viagra is one of the most counterfeited drugs in the world. Each year, Operation Pangea, conducted by Interpol and dozens of countries, seizes millions of fake medication tablets, a large portion of which are Viagra and Cialis.

These counterfeits can be not only ineffective but also extremely dangerous to health. In 2010, the Swiss Institute of Therapeutic Products analyzed 120 samples of fake drugs for erectile dysfunction. The results were alarming: some tablets were overdosed by up to 180%, increasing the risk of serious adverse effects. Others contained no active ingredient, but undeclared or toxic substances, such as heavy metals or ink.

How to safely obtain Viagra?

To avoid the risks associated with counterfeit drugs, it is imperative to obtain Viagra through a medical prescription. This prescription can be acquired during a consultation with your primary care physician or through certified online platforms, such as Kano. These sites offer remote consultations with doctors, who can assess your situation and issue a prescription if necessary.

By obtaining Viagra legally, you are assured that the medication is safe and suitable for your condition. Moreover, medical follow-up allows for the adjustment of the treatment if necessary, and to prevent any adverse effects or drug interactions.

In conclusion, although Viagra is an effective treatment for erectile dysfunction, it should always be used under the supervision of a healthcare professional. Do not put your health at risk by purchasing this medication from uncertified sites. Each situation is unique and requires a personalized medical evaluation to ensure your safety and well-being.

Getting a prescription for Viagra
Dr. Sam Ward - Urologue et Andrologue

Révision médicale par le Dr. Sam Ward

Directeur médical, Urologue et Andrologue

Le Docteur Sam Ward, urologue et andrologue, dirige le service d'urologie à la Clinique Saint-Jean de Bruxelles depuis octobre 2024. Membre du Comité exécutif de la Chaire UNESCO Santé sexuelle & Droits humains et cofondateur de Kano.care, il est spécialise en santé masculine et médecine sexuelle.

En savoir plus sur notre équipe médicale

Reviewed on 4/7/2025

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Sildenafil and tadalafil work by increasing blood flow to the penis, thus facilitating an erection, but their use requires a prescription to avoid side effects.

What medication should be taken to achieve an erection?

Erectile dysfunction affects many men at different times in their lives. Whether related to stress, fatigue, medical or psychological causes, it can have a significant impact on self-confidence and quality of life. Faced with this issue, many seek medicinal solutions to achieve a satisfactory erection. However, it is essential to remember that only treatments prescribed by a doctor after a consultation are acceptable. Self-medication or purchasing drugs from unapproved sites can be dangerous to health.

Medicinal treatments such as Viagra and Cialis, available through Kano.care, offer an immediate and scientifically validated solution, unlike dietary supplements which remain unproven.

Medication vs Dietary Supplement for better erections.

In a market flooded with solutions for erectile dysfunction, it is essential to distinguish truly effective treatments from products that are at best supplementary, at worst ineffective. The difference between a medication and a dietary supplement is crucial, as it directly affects the health and effectiveness of the proposed solutions. At Kano, we have chosen to offer our patients access to approved medicinal treatments prescribed by health professionals, thus ensuring optimal and effective management of erectile dysfunction.

Viagra is an effective medication for erectile dysfunction, but its use must be supervised by a healthcare professional. Indeed, improper use can lead to serious side effects and dangerous interactions.

How to buy Viagra? (or Sildenafil)

Viagra is a medication used to treat erectile dysfunction, but unlike other products that are freely available, it cannot be purchased directly from a pharmacy or online without a prescription. Its acquisition is based on a medical prescription, as its use must be regulated to ensure its effectiveness and to avoid health risks. Discover in this article why Viagra requires a prescription, how a medical consultation on Kano.care proceeds, and why one should be wary of products sold illegally online.

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Why can't you buy Cialis online without a consultation and a medical prescription?

Purchasing Cialis online without a medical prescription exposes you to major dangers, such as counterfeit drugs, illegal websites, and the lack of medical follow-up. This treatment for erectile dysfunction requires a prior medical evaluation to ensure its effectiveness and to avoid risks associated with contraindications or improper dosing. Kano.care offers a legal and secure alternative through online consultations, reliable prescriptions, and fast and discreet delivery. By choosing Kano.care, you benefit from comprehensive care that respects medical practices and focuses on your intimate health.

Les sites qui proposent du Viagra sans ordonnance sont souvent illégaux et insécurisés, mettant en danger la santé et les données personnelles des utilisateurs.

Pourquoi vous ne pouvez pas acheter du Viagra en ligne sans consultation et prescription médicale?

Le Viagra, reconnu mondialement pour son efficacité dans le traitement de la dysfonction érectile, ne doit pas être considéré comme un médicament anodin. Son acquisition requiert une approche responsable et encadrée par des professionnels de santé. Si vous vous interrogez sur l’impossibilité d’acheter légalement du Viagra en ligne sans consultation médicale, sachez que cela repose sur des impératifs de sécurité, de légalité et de santé publique. Cet article met en lumière les dangers de l’achat non encadré de Viagra et présente l’approche rigoureuse de Kano.care, qui offre un accès légal, sécurisé et médicalement supervisé à ce traitement.

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Treatments for erectile dysfunction, such as Viagra®, Cialis®, Levitra®, and Spedra®, carry potential risks that vary depending on the patient's health condition. They may cause serious side effects, including cardiovascular issues, dangerous drug interactions, or prolonged erections (priapism), which require immediate medical attention. It is essential never to take these medications without the advice of a qualified healthcare professional. A thorough medical consultation is necessary to determine the appropriate treatment for each individual, taking into account medical history and contraindications. Additionally, it is crucial to ensure that the medications are obtained from reliable and authorized sources. Medications purchased outside legal channels or without a prescription may be counterfeit, ineffective, or even harmful to health. Always consult a doctor before using these treatments and obtain medications from a licensed pharmacy.

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