Fildena contains sildenafil citrate, which increases blood flow to the penis during sexual stimulation. It is intended for adult men with erectile dysfunction and supports the physiological process needed to achieve and maintain an erection. The available presentation contains 100 mg sildenafil citrate per tablet.
Fildena is an oral sildenafil citrate tablet for erectile dysfunction in adult men. Sildenafil belongs to the phosphodiesterase type 5 (PDE5) inhibitor class. The product presentation contains 100 mg sildenafil citrate per tablet, with 10 strips of 10 tablets.
Sildenafil citrate is rapidly absorbed after oral administration. Blood concentrations generally reach their highest level within about 30 to 120 minutes, with a typical median close to 60 minutes. A heavy, high-fat meal can delay absorption and may make the onset feel slower [1].
The medicine is metabolised mainly in the liver through CYP3A4, with a smaller contribution from CYP2C9. Medicines that inhibit these enzymes can increase sildenafil exposure. Kidney or liver impairment may also change how the body handles sildenafil.
Fildena does not permanently change erectile function. Its effect is temporary and linked to the presence of the active drug in the body.
Dosing differs between strengths and between users, so there is no single amount that suits everyone. The appropriate amount depends on age, kidney and liver function, other medicines, tolerability, and the response to treatment.
A frequent practical error is taking a second tablet because the first dose did not produce an immediate result. Sildenafil may require sexual stimulation and enough time for absorption. Taking more within the same 24-hour period increases the chance of headache, low blood pressure, visual symptoms, and other adverse effects.
Use is generally limited to one oral dose in 24 hours.
People aged 65 years or older, or those with significant liver or kidney impairment, may need a lower starting dose. The same applies to people taking potent CYP3A4 inhibitors or medicines that lower blood pressure.
The product sold on this page is a tablet presentation. Fildena contains sildenafil citrate. The formulation is intended for oral use.
During sexual stimulation, nitric oxide is released in penile tissue. This activates an enzyme that increases cyclic guanosine monophosphate, known as cGMP. cGMP relaxes smooth muscle in the penile blood vessels, allowing greater blood flow into the erectile tissue.
PDE5 breaks down cGMP. Sildenafil blocks PDE5, helping cGMP remain active for longer. The result is improved blood flow when sexual arousal is present. Sildenafil does not create sexual desire and does not produce an erection without stimulation.
Fildena is used for erectile dysfunction, a condition involving difficulty achieving or maintaining an erection adequate for sexual activity. The treatment improves the blood-flow response to sexual stimulation; it does not treat low sexual desire, infertility, or premature ejaculation.
Several usage patterns reduce the likelihood of a satisfactory response:
A missed dose does not require compensation. Since Fildena is used when needed, the next planned dose should remain within the 24-hour limit.
Fildena is not suitable for everyone.
Nitrates and sildenafil can produce a dangerous fall in blood pressure when used together. The interaction remains clinically relevant even when the nitrate is used only occasionally. The European Medicines Agency identifies concomitant nitrate use as a major contraindication for sildenafil [2].
Alpha-blockers, such as tamsulosin or doxazosin, can also lower blood pressure when combined with sildenafil. If both are prescribed, clinicians often use the lowest sildenafil dose and consider the timing of the medicines.
Other important interactions include:
Do not combine sildenafil with another PDE5 inhibitor. Combining treatments from the same pharmacological class does not reliably improve erectile function and can increase adverse effects.
Fildena may not be right for you if you use medicines or recreational products containing nitrates, have been advised to avoid sexual activity because of a serious heart condition, or have previously had a severe allergic reaction to sildenafil. You should also speak with a specialist before using it if you have a retinal condition, a history of certain optic-nerve problems, very low blood pressure, or unstable angina.
Common adverse effects of sildenafil include headache, facial flushing, indigestion, nasal congestion, dizziness, and visual changes. These effects are related to blood-vessel relaxation and are often temporary. The FDA prescribing information describes headache and flushing among the recognised adverse reactions reported during clinical use [1].
Visual symptoms may include a blue or altered colour tinge, blurred vision, or increased sensitivity to light. New, severe, or persistent visual loss requires urgent assessment. A sudden reduction or loss of hearing also requires prompt medical attention.
Rare but serious reactions include:
Priapism, meaning a prolonged erection that may damage penile tissue, is an emergency. Waiting for it to resolve can increase the risk of permanent erectile problems.
One detail patients often overlook is that sildenafil can make dizziness more noticeable when combined with dehydration, alcohol, or other blood-pressure-lowering medicines. Another is that facial flushing may feel like warmth across the cheeks and chest rather than a skin allergy.
Erectile-dysfunction treatments differ in duration, metabolism, onset, and interaction profile. Comparing the active ingredients is more useful than comparing product names.
| Active ingredient | Main class | Typical practical profile |
|---|---|---|
| Sildenafil | PDE5 inhibitor | Often taken about 30–60 minutes before sexual activity; food can delay absorption |
| Tadalafil | PDE5 inhibitor | Longer duration of action; daily and as-needed regimens may be used |
| Vardenafil | PDE5 inhibitor | Similar mechanism to sildenafil, with individual differences in onset and tolerability |
Sildenafil and vardenafil both support erection by inhibiting PDE5. Tadalafil has a longer half-life, so its window of action is longer. That extended duration can be useful for spontaneity, while sildenafil may suit men who prefer an as-needed medicine with a shorter active period.
The choice depends on cardiovascular status, other medicines, kidney and liver function, the preferred timing of sexual activity, and previous tolerability. A longer duration is not automatically better. It may also mean that adverse effects persist for longer if they occur. Men may prefer a shorter window when sexual activity can be planned. The choice should reflect treatment response, tolerability, and clinical risk.
Brand names and formulations containing the same active ingredient should not be combined. A tablet, oral jelly, or other sildenafil formulation still contributes to the same total sildenafil exposure.
In clinical practice, physicians usually assess cardiovascular fitness before prescribing treatment for erectile dysfunction. Sexual activity increases cardiac workload, so unstable angina, recent serious cardiovascular events, or poorly controlled blood pressure can change the risk assessment.
A doctor would also review every medicine used for chest pain, urinary symptoms, hypertension, HIV infection, and fungal infections. The medication history matters because several interactions involve common prescription medicines rather than rare treatments.
One practical clinical point is that inadequate response does not always mean sildenafil has failed. Large meals, high alcohol intake, anxiety, poor timing, and insufficient stimulation can all reduce the apparent benefit. Repeatedly increasing the dose without identifying the cause exposes the patient to more risk without solving the underlying problem.
Erectile dysfunction can also accompany diabetes, vascular disease, hormonal disorders, depression, and medication adverse effects. Persistent symptoms may warrant assessment of blood pressure, glucose, cardiovascular risk, and testosterone when clinically indicated. The WHO recognises erectile dysfunction as a common health condition with physical and psychological contributors [3].
Fildena can be taken with or without food, but a high-fat meal may delay sildenafil absorption. A lighter meal or an empty stomach may provide a more predictable onset for some men. FDA information reviewed in 2024 describes food-related delay without indicating that food completely prevents the medicine from working. Alcohol should remain limited because it can worsen dizziness and erectile difficulty.
Sildenafil may add to the blood-pressure-lowering effect of alpha-blockers and some antihypertensive medicines. It must not be combined with nitrates or nitrate-containing recreational products because the combination can cause severe hypotension. Health Canada information reviewed in 2025 also supports checking for interactions involving cardiovascular medicines and potent enzyme inhibitors. Supplements marketed for sexual performance should not be added without reviewing their ingredients and interaction risks.
Do not take another tablet within the same 24-hour period if the first dose seems ineffective. Check practical factors such as timing, a heavy meal, alcohol, and the presence of sexual stimulation, then discuss repeated poor response with a prescriber. The European Medicines Agency information available in 2025 describes dose selection and response as individual matters rather than a reason for unsupervised dose escalation. Persistent erectile dysfunction may also require evaluation for diabetes, vascular disease, medication effects, or hormonal problems.
Use with nitrate medicines for angina is a clear reason to avoid sildenafil. The interaction can cause a rapid and dangerous drop in blood pressure, even when the nitrate is used intermittently. The American Heart Association clinical material reviewed in 2023 continues to treat nitrate use and unstable cardiovascular disease as key issues in sexual-activity risk assessment. A history of severe allergy to sildenafil is another direct reason not to use it.
Headache and facial flushing are recognised sildenafil adverse effects. They result from blood-vessel relaxation and may occur together with nasal congestion, indigestion, or dizziness. FDA safety information reviewed in 2024 lists these effects among the reactions associated with sildenafil. Severe symptoms, fainting, chest pain, or neurological changes require urgent medical assessment rather than another dose.
Fildena is taken as needed and does not normally require tapering. Stopping it does not cause a withdrawal syndrome, though erectile dysfunction may return because the underlying condition remains. WHO clinical material reviewed in 2022 describes erectile dysfunction as a condition that may persist or fluctuate according to vascular, metabolic, psychological, and relationship factors. A sudden change in erectile function after starting another medicine deserves a medication review.
Fildena does not have a fixed course length because it is generally used before anticipated sexual activity rather than on a compulsory daily schedule. Long-term intermittent use may be acceptable when a prescriber has reviewed cardiovascular status, interactions, kidney or liver function, and tolerability. EMA information reviewed in 2025 supports continued reassessment when treatment is used over an extended period. Do not exceed one dose in 24 hours, and seek medical assessment for persistent adverse effects or a prolonged erection.
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I used Fildena before planned sexual activity and noticed a clear improvement in erection firmness. The effect was reliable when I avoided a heavy dinner beforehand, and I was satisfied with the result.
Fildena helped me maintain an erection instead of losing it halfway through sex. I found that allowing enough time before intimacy made the experience much more predictable.
I tried the tablet twice and did not get the result I expected. I developed a strong headache and decided to stop rather than take another dose, then discussed the problem with my doctor.
The medicine helped, but the response was slower after I took it following a heavy meal. I also had mild flushing, so the benefit came with a reservation about timing and comfort.
Fildena gave me a noticeable improvement in erection quality during several planned occasions. I used it only when needed and found the 100 mg tablet convenient for my treatment routine.
