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Quick facts

  • Active ingredient: sildenafil citrate (a PDE-5 inhibitor)
  • Primary indication: erectile dysfunction (ED) in adult men
  • Onset and duration: usually starts working in about 30 to 60 minutes and may remain effective for up to 4 to 6 hours
  • Food effect: a high-fat meal can slow the onset of action
  • Not a contraceptive and does not prevent sexually transmitted infections

What is Fildena?

Fildena is a brand of sildenafil citrate, a medicine designed to help men with erectile dysfunction achieve and maintain an erection sufficient for sexual activity. Although it is discussed in the context of men’s sexual health, it is not intended for use in women or children.

Typical strengths available on the market include 25 mg, 50 mg, 100 mg, and some manufacturers also offer 150 mg and 200 mg tablets. Doses above 100 mg are not standard in U.S. prescribing references and may increase the risk of adverse effects; use only as directed by a licensed clinician.

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How does it work?

Sildenafil inhibits the enzyme phosphodiesterase type 5 (PDE‑5). During sexual stimulation, this inhibition supports the release and activity of nitric oxide and increases blood flow to the penile tissue, making it easier to get and keep an erection.

Sexual arousal is required for the medicine to be effective; it does not trigger an erection in the absence of stimulation.

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How to take Fildena

Follow the dose recommended by your healthcare provider. Many patients start at 50 mg taken by mouth about 30 to 60 minutes before sexual activity. Based on response and tolerability, the dose may be adjusted to 25 mg or 100 mg. Do not take more than one dose in a 24-hour period.

  • Take only when sexual activity is anticipated; it is not meant for daily use unless specifically instructed.
  • A heavy or high-fat meal can delay onset; consider a lighter meal for faster effect.
  • Avoid combining with other ED medicines in the same day.
  • Alcohol may reduce performance and increase side effects such as dizziness.

Note on sports: Fildena is not a performance-enhancing drug for athletics. While PDE‑5 inhibitors have been studied for altitude tolerance, they are not indicated for general sports performance.

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Storage conditions

Store at room temperature below 30 degrees Celsius (86 degrees Fahrenheit), away from excess moisture and heat. Keep the medication in its original packaging, out of reach of children and pets. Do not use past the expiration date and avoid storing it in bathrooms or other humid areas.

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Who should not use it (Contraindications)

  • People using nitrates or nitric oxide donors for chest pain (for example, nitroglycerin, isosorbide dinitrate/mononitrate) or using recreational "poppers" (amyl nitrite): severe, dangerous blood pressure drops can occur.
  • Patients taking riociguat (a soluble guanylate cyclase stimulator).
  • Anyone with a known allergy to sildenafil or tablet ingredients.
  • Children and women should not use Fildena for ED.

Use only with medical guidance if you have unstable cardiovascular disease, recent stroke or heart attack, severe liver impairment, advanced kidney disease, certain retinal disorders (such as retinitis pigmentosa), very low blood pressure, or if your doctor has advised against sexual activity.

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Important drug interactions

Several medicines can raise sildenafil levels or increase side effects. Discuss all prescriptions, OTC products, recreational substances, and supplements with your prescriber. Notable interactions include:

  • Strong CYP3A inhibitors such as ritonavir or cobicistat, ketoconazole, itraconazole, and clarithromycin (may require major dose reduction or avoidance).
  • Other PDE‑5 inhibitors or ED medications (tadalafil, vardenafil, avanafil): do not combine.
  • Alpha-blockers and antihypertensive agents: additive blood pressure lowering; dose timing and monitoring may be needed.
  • Nitrates and nitric oxide donors: contraindicated.
  • Certain antibiotics and antifungals, some HIV therapies, and anti-tubercular drugs may interact; your clinician will advise a safe plan.
  • Grapefruit or grapefruit juice can increase blood levels of sildenafil.

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Possible side effects

Many people tolerate sildenafil well, but some may experience side effects. These are often mild and short-lived.

  • Common: headache, facial flushing, nasal congestion, upset stomach or indigestion, dizziness.
  • Occasional: back or muscle pain, nausea, visual color tinge (bluish vision), light sensitivity.
  • Rare but serious: chest pain, sudden vision or hearing loss, priapism (a painful erection lasting more than 4 hours). Seek immediate medical help if these occur.
  • Palpitations or a fluttering feeling during sex can happen; stop and get medical advice if symptoms are severe or persistent.

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Alternatives and similar medicines

If Fildena is not suitable or not effective, other FDA-approved PDE‑5 inhibitors and comparable options exist. Discuss these with your clinician:

  • Tadalafil (Cialis, generics): longer duration (up to 36 hours); available as on-demand doses (e.g., 10 mg, 20 mg) or daily low doses (2.5 mg, 5 mg).
  • Vardenafil (Levitra; orally disintegrating Staxyn): similar onset to sildenafil, slightly different food effect profile.
  • Avanafil (Stendra): faster onset in some patients (as early as 15 to 30 minutes).
  • Generic sildenafil citrate: same active ingredient as Fildena/Viagra; wide range of manufacturers and prices.
  • Non-oral options: vacuum erection devices, penile injections (alprostadil), intraurethral alprostadil, psychotherapy for psychogenic ED, and lifestyle changes (weight management, smoking cessation, exercise).

Choice depends on onset preference, duration, side-effect profile, interactions, and cost. Avoid combining multiple ED medications on the same day unless a specialist explicitly recommends it.

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Approximate prices in the USA

Cash prices vary by pharmacy, manufacturer, dose, and available coupons. The ranges below are rough out-of-pocket estimates per tablet in USD at the time of writing:

  • Generic sildenafil 100 mg: about $1 to $5 per tablet with common discount programs; higher at some pharmacies.
  • Brand Viagra 50–100 mg: often $70 to $90+ per tablet without insurance or coupons.
  • Tadalafil 10–20 mg (generic): typically $1 to $8 per tablet; brand Cialis is higher.
  • Vardenafil 10–20 mg (generic): roughly $3 to $10 per tablet; brand versions cost more.
  • Avanafil (Stendra) 100–200 mg: frequently $12 to $30+ per tablet.

Insurance coverage for ED medications varies; many plans exclude them, while some telehealth services offer subscription pricing. Always compare pharmacies and use legitimate discount programs.

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FAQs and practical tips

  • How fast does it work? Many users notice effects within 30–60 minutes; a light meal is preferable to a heavy one.
  • How often can I take it? No more than once daily. If it does not work the first time, try on 4 to 8 separate occasions before concluding it is ineffective; dosing or timing may need adjustment.
  • Can I drive? If you experience dizziness or visual changes, do not drive or operate machinery.
  • Is it safe with alcohol? Limit alcohol; excessive intake can worsen ED and increase side effects.
  • What if I have ED and cardiovascular disease? Get a heart-health evaluation first; sexual activity itself stresses the heart.

Medical disclaimer: This page is informational and not a substitute for professional medical advice. Always follow your prescriber’s instructions.

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