What are the ingredients in Viagra?
Sildenafil is Viagra's active medicine, while inactive ingredients and appearance can vary by approved manufacturer.
Viagra contains sildenafil citrate as its active ingredient. The tablet also contains inactive ingredients that form, stabilise, coat, and colour it. Generic sildenafil has the same active medicine but may use different inactive ingredients, shape, and packaging.
What is the active ingredient in Viagra?
Sildenafil is a PDE5 inhibitor. During sexual stimulation, it slows the breakdown of cGMP, helping smooth muscle relax and blood flow enter the penis. It does not create sexual desire and has little erectile effect without stimulation.
The labelled strength refers to the amount of sildenafil, not the total weight of sildenafil citrate or the tablet. Common prescribed strengths differ by market and indication.
What are the inactive ingredients?
Brand formulations commonly include tablet-building substances such as microcrystalline cellulose, calcium phosphate, croscarmellose sodium, and magnesium stearate, plus a film coating and colourants. Exact lists can change by country, manufacturer, and approved product, so the package leaflet is authoritative for the tablet in hand.
Inactive does not mean irrelevant. A person with a known allergy or intolerance should show the pharmacist the exact product. Do not rely on a list copied from a different country's package.
Brand Viagra versus generic sildenafil
| Feature | Brand Viagra | Approved generic sildenafil |
|---|---|---|
| Active ingredient | Sildenafil | Sildenafil |
| Clinical purpose | Erectile dysfunction at labelled strengths | Same approved purpose when labelled for ED |
| Inactive ingredients | Brand-specific | May differ by manufacturer |
| Appearance | Recognisable brand design | May use another colour or shape |
| Quality | Regulated product | Regulated generics must meet approval standards |
A different appearance does not make an approved generic inferior. Conversely, a copied blue tablet is not proven genuine by appearance.
Why product identity matters
Unregulated sexual-enhancement products have been found with hidden sildenafil, tadalafil, multiple drugs, or inaccurate doses. These can interact dangerously with nitrates or cause unexpected prolonged exposure. Buy through a licensed pharmacy and check the sealed label, manufacturer, strength, batch, and expiry.
The street Viagra guide explains why informal tablets cannot be authenticated by price or imprint.
Sildenafil in other medicines
Sildenafil is also used for pulmonary arterial hypertension under different brands, strengths, and schedules. Those products are not interchangeable with an ED prescription. Taking both can accidentally duplicate the active ingredient.
Always list every sildenafil-containing product. The same applies before adding tadalafil; Cialis and Viagra should not be combined casually.
Allergies, interactions, and urgent effects
Tell the clinician about allergies, nitrates, riociguat, alpha-blockers, heart disease, low blood pressure, kidney or liver disease, and previous serious eye problems. Common effects include headache, flushing, indigestion, and nasal congestion.
Seek urgent care for chest pain, fainting, sudden loss of vision or hearing, or an erection lasting four hours. For correct use and response problems, see how to use sildenafil effectively.
Ingredient knowledge supports safer choices but does not replace an assessment. Return to the erectile dysfunction guide for causes, access, and treatment options.
How to check the product you received
Compare the pharmacy label with the sealed carton and blister: medicine name, active strength, manufacturer, batch, and expiry should agree. Read the leaflet before the first dose. If spelling, seals, tablets, or packaging differ unexpectedly, do not take it until the dispensing pharmacy confirms the product.