Czym jest Viagra?
Viagra (sildenafil citrate) is a prescription-only oral medicine approved by the Europejska Agencja Leków (EMA) for the treatment of erectile dysfunction (ED) in adult men. It was the first oral PDE5 inhibitor approved for this indication and has been prescribed globally for over two decades, accumulating a well-established clinical safety and efficacy profile.
Sildenafil citrate is the active ingredient in Viagra and is also available as a generic medicine under the name sildenafil.
Jak działa Viagra work?
Viagra belongs to a class of medicines called phosphodiesterase type 5 (PDE5) inhibitors. Erections are achieved through a sequence of physiological events: sexual stimulation triggers the release of nitric oxide in penile tissue, which activates an enzyme that produces cyclic guanosine monophosphate (cGMP). cGMP relaxes smooth muscle cells in the blood vessels of the penis, allowing increased blood flow and producing an erection.
In men with erectile dysfunction, the enzyme PDE5 breaks down cGMP too rapidly, preventing the erection from developing or being sustained. Sildenafil inhibits PDE5, allowing cGMP to accumulate and supporting normal erectile function in response to sexual stimulation.
Key point: Viagra does not produce an erection on its own. Sexual stimulation is required for the medicine to be effective.
Dla kogo jest Viagra for?
Viagra is indicated for adult men experiencing erectile dysfunction — defined by the EMA as the persistent or recurrent inability to attain or maintain a penile erection sufficient for satisfactory sexual performance.
ED may have physical causes (cardiovascular disease, diabetes, hormonal imbalances, neurological conditions), psychological causes (anxiety, depression, relationship factors), or a combination of both. A medical assessment is required to determine whether sildenafil is an appropriate and safe treatment option for an individual patient.
Viagra is not appropriate for everyone. It is contraindicated in men who:
- Take nitrate medicines in any form (including short-acting nitroglycerin tablets)
- Have been advised to avoid sexual activity for cardiac reasons
- Have severe hepatic impairment
- Have a history of non-arteritic anterior ischaemic optic neuropathy (NAION)
- Are under 18 years of age
Dawkowanie
Viagra is taken orally, approximately 30 to 60 minutes before anticipated sexual activity. It is available in three strengths:
| Dose | Typical Use |
|---|---|
| 25 mg | Starting dose for men aged 65 or over, or those with hepatic or renal impairment |
| 50 mg | Standard starting dose for most adult men |
| 100 mg | If 50 mg is well-tolerated but insufficiently effective |
The maximum recommended dose is 100 mg per day. Viagra should not be taken more than once in a 24-hour period.
Taking Viagra on an empty stomach or with a light, low-fat meal generally produces a faster onset of action. A high-fat meal can delay absorption by up to 60 minutes and reduce peak plasma concentrations.
Patients should not adjust their dose without consulting their prescribing doctor.
Skutki uboczne
As with all medicines, Viagra may cause side effects. Not every patient experiences them.
Częste skutki uboczne (mogą dotyczyć więcej niż 1 na 10 osób)
- Headache
- Flushing (warmth, redness, or tingling in the face and neck)
- Indigestion or dyspepsia
- Nasal congestion
Rzadsze side effects (mogą dotyczyć do 1 na 10 osób)
- Visual disturbances (blurred vision, temporary blue-tinged vision, increased sensitivity to light)
- Dizziness
- Nausea
- Back pain
Poważne skutki uboczne — natychmiast zasięgnij pomocy medycznej
- Sudden vision loss: Rare cases of non-arteritic anterior ischaemic optic neuropathy (NAION) have been reported. Stop taking sildenafil and seek urgent medical attention if sudden vision loss occurs.
- Sudden hearing loss: Stop treatment and contact a doctor immediately.
- Priapism: A prolonged erection lasting more than 4 hours (not related to sexual stimulation) is a medical emergency. Seek immediate medical attention to prevent permanent damage.
- Severe hypotension: Particularly if sildenafil is taken with nitrates or alcohol.
- Serious allergic reactions: Including skin rash, swelling of the face, lips, or throat, and difficulty breathing.
This is not a complete list. Refer to the EMA-approved product information for full prescribing details.
Viagra a alternatywy
Several PDE5 inhibitors are approved in Europe for erectile dysfunction. The table below provides a factual comparison for informational purposes only. A doctor must assess which, if any, of these medicines is clinically appropriate for an individual patient.
| Medicine | Active Ingredient | Onset | Duration | Dosing |
|---|---|---|---|---|
| Viagra | Sildenafil Citrate | 30–60 min | 4–6 hours | On demand |
| Cialis | Tadalafil | 30–60 min | Up to 36 hours | On demand or daily |
| Levitra | Vardenafil | 25–60 min | 4–5 hours | On demand |
| Generic Viagra | Sildenafil | 30–60 min | 4–6 hours | On demand |
Key differences:
- Viagra vs Cialis: Tadalafil (Cialis) has a significantly longer duration of action (up to 36 hours versus 4–6 hours for sildenafil), and is also available as a low-dose daily tablet for continuous effect. Sildenafil onset of action is broadly similar.
- Viagra vs Levitra: Vardenafil (Levitra) has a slightly faster onset in some patients and may be suitable for men for whom sildenafil has been less effective. Both have a comparable duration of action.
- Viagra vs Generic Sildenafil: Generic sildenafil contains the same active ingredient at the same doses and has the same clinical efficacy. The difference is in brand and price.
Jak uzyskać dostęp do Viagra online w Europie
Viagra is a lek wydawany na receptę (POM) in all państwach członkowskich UE. It cannot be legally dispensed without a valid prescription from a licensed medical professional.
Prescrivia operates as a technology intermediary: we do not prescribe medicines, employ doctors, or sell medicines. Our platform connects patients with independent EU-registered doctors who can conduct confidential online health assessments.
The process works as follows:
- Wypełnij ocenę stanu zdrowia: Answer a structured set of health questions covering your medical history, current medications, and relevant lifestyle factors. This assessment is reviewed by an independent doctor.
- Ocena lekarska: An independent EU-registered doctor reviews your assessment. If sildenafil citrate is clinically appropriate, they may issue a prescription. If it is not appropriate, the doctor will explain why.
- Recepta i realizacja: If a prescription is issued, it is sent to a licensed EU pharmacy partner. The pharmacy dispenses and ships the medicine directly to you.
Important: Prescrivia nie gwarantuje that a prescription will be issued. All prescribing decisions are made independently by qualified medical professionals based on individual clinical circumstances.
Ważne informacje dotyczące bezpieczeństwa
Nie stosować Viagra if you:
- Take any nitrate medicines (for example, glyceryl trinitrate, isosorbide mononitrate, or isosorbide dinitrate)
- Use recreational drugs containing nitrates (such as amyl nitrite or “poppers”)
- Have been told by a doctor to avoid sexual activity because of heart problems
- Are allergic to sildenafil or any other ingredient in Viagra
- Have severe liver disease
Poinformuj lekarza before starting Viagra if you have:
- Heart disease or have recently had a heart attack or stroke
- Low blood pressure or uncontrolled high blood pressure
- A hereditary degenerative retinal disorder (such as retinitis pigmentosa)
- A history of priapism
- Sickle cell anaemia, multiple myeloma, or leukaemia
- Anatomical deformation of the penis (such as Peyronie’s disease)
Interakcje lekowe: Viagra interacts with nitrates, alpha-blockers, antihypertensive medicines, CYP3A4 inhibitors (including ketoconazole, itraconazole, ritonavir, and saquinavir), and other PDE5 inhibitors. Always disclose all current medications and supplements to your doctor.
Avoid excessive alcohol consumption when taking Viagra, as alcohol can increase the risk of low blood pressure and reduce the medicine’s effectiveness.
Źródła
Medical information on this page is based on the following sources:
- Europejska Agencja Leków (EMA). Viagra (sildenafil) — Summary of Product Characteristics. Available at: ema.europa.eu
- Europejska Agencja Leków (EMA). Assessment report: Viagra. EMEA/H/C/000202.
- Światowa Organizacja Zdrowia (WHO). Sexual health — Fact sheet. who.int
- Goldstein I, et al. Oral sildenafil in the treatment of erectile dysfunction. N Engl J Med. 1998;338:1397-1404.
This content is reviewed periodically to reflect updated clinical guidance. It is provided for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for advice relevant to your individual health circumstances.
Frequently asked questions
- Czym jest Viagra used for?
- Viagra contains sildenafil citrate and is approved by the Europejska Agencja Leków (EMA) for the treatment of erectile dysfunction (ED) in adult men. Erectile dysfunction is defined as the persistent inability to achieve or maintain an erection sufficient for satisfactory sexual activity.
- Jak długo trwa Viagra take to work?
- Viagra typically begins to take effect within 30 to 60 minutes of taking a dose. The window of effect lasts approximately 4 to 6 hours. Taking it with a heavy or high-fat meal may delay the onset of action.
- Czy mogę uzyskać Viagra online w Europie?
- You can access Viagra through online intermediary platforms that connect you with independent EU-registered doctors. After completing a confidential health assessment, a doctor will review whether sildenafil citrate is clinically appropriate for you. Prescrivia does not prescribe or dispense medicines — we connect you with qualified professionals.
- Jakie są najczęstsze skutki uboczne of Viagra?
- Częste skutki uboczne include headache, flushing (warmth and redness of the face), indigestion, nasal congestion, and temporary visual disturbances such as a blue-tinged tint or increased light sensitivity. These effects are generally mild and short-lived.
- Is Viagra safe to take with other medications?
- Viagra has several clinically significant drug interactions. It must not be taken with nitrates (used for chest pain or heart conditions) as this combination can cause a dangerous drop in blood pressure. It should also be used with caution alongside alpha-blockers, antihypertensives, and certain antifungal or antiretroviral medicines. Always disclose all current medications to the reviewing doctor during your health assessment.
Leczenie
Prescrivia jest wyłącznie platformą pośredniczącą. Nie świadczymy usług medycznych, nie przepisujemy leków ani nie wydajemy leków. Wszystkie decyzje medyczne podejmowane są przez niezależnych lekarzy zarejestrowanych w UE. Wszystkie leki wydawane są przez licencjonowane apteki w UE. Platforma ta ułatwia kontakt między pacjentami a podmiotami świadczącymi opiekę zdrowotną.