What sildenafil tablets look like
Sildenafil tablets come in several shapes, sizes, and colors depending on the dose and manufacturer. The most common appearance is a blue, diamond-shaped tablet — this is the brand-name Viagra formulation at 50 mg. However, generic sildenafil comes in many other forms: white, round tablets; oblong tablets in various colors; and tablets marked with different imprints depending on which pharmaceutical company made them.
The imprint on the tablet — the numbers, letters, or symbols stamped into the surface — is the most reliable way to identify what you have. Every legitimate sildenafil tablet sold in the United States carries an imprint that corresponds to its manufacturer, dose, and active ingredient. If a tablet has no imprint, or the imprint does not match a known sildenafil product, it may not be what the label says it is.
Sildenafil is available in 25 mg, 50 mg, and 100 mg doses. The dose does not always determine the color or shape — different manufacturers use different designs for the same dose. This means you cannot tell the strength just by looking at the color.
Key Takeaways
- Brand-name Viagra is a blue diamond shape, but generic sildenafil comes in many colors and shapes depending on the manufacturer.
- The imprint stamped on the tablet is the only reliable way to confirm what dose and brand you have.
- Sildenafil comes in 25 mg, 50 mg, and 100 mg strengths, and color alone does not tell you the dose.
- Tablets without an imprint, or with an imprint that does not match known products, should not be taken without verification from a pharmacist.
- Always obtain sildenafil from a licensed pharmacy with a valid prescription, as counterfeit tablets exist and may contain harmful substances.
Common sildenafil tablet imprints and what they mean
The imprint on a sildenafil tablet is a code that identifies the manufacturer and the dose. For example, a tablet imprinted with "PFIZER VGR 50" is Viagra 50 mg made by Pfizer. A tablet marked "93 7258" is a generic sildenafil 50 mg made by Teva Pharmaceuticals. These codes are registered with the U.S. Food and Drug Administration, and you can look them up to confirm what you have.
If you want to verify an imprint, you can search the FDA's National Library of Medicine pill identifier tool or ask your pharmacist. They can tell you the exact dose, manufacturer, and active ingredient in seconds. This is especially important if you received a tablet from an unfamiliar source or if the appearance does not match what you expected.
Generic sildenafil is chemically identical to brand-name Viagra and works the same way. The difference is only in appearance, price, and manufacturer. A generic tablet marked with a different imprint is not counterfeit — it is straightforward made by a different company that the FDA has approved to produce sildenafil.
How to spot counterfeit or unsafe sildenafil tablets
Counterfeit sildenafil tablets exist and may contain no active ingredient, the wrong dose, or harmful substances. The safest way to avoid them is to fill your prescription only at a licensed pharmacy in the United States. Online pharmacies that do not require a prescription, or that ship from outside the U.S., carry a high risk of counterfeit products.
Red flags for counterfeit tablets include: an imprint that does not match any known product when you search it; spelling errors on the packaging or label; tablets that look noticeably different from what your pharmacy gave you before; and a price far lower than the market rate. If you are unsure whether a tablet is real, do not take it — contact your pharmacist or doctor instead.
Counterfeit sildenafil has been found to contain substances like tadalafil (a different erectile dysfunction drug), harmful fillers, or no active ingredient at all. Taking an unknown tablet puts your health at risk. Your pharmacist can verify any tablet you have questions about.
Sildenafil tablets by dose and typical appearance
| Dose | Brand-Name Appearance | Generic Appearance (Examples) |
|---|---|---|
| 25 mg | Blue diamond (Viagra) | White round, pink round, or oblong tablets depending on manufacturer |
| 50 mg | Blue diamond (Viagra) | White round, round with imprint, or oblong tablets depending on manufacturer |
| 100 mg | Blue diamond (Viagra) | White round, round with imprint, or oblong tablets depending on manufacturer |
The table above shows that brand-name Viagra maintains the same blue diamond shape across all doses, while generic versions vary widely. This is why the imprint is so important — it is the only way to know for certain what you are taking.
When you receive a new prescription or switch to a different generic manufacturer, the tablet appearance may change even though the medication is the same. Always ask your pharmacist to confirm the imprint matches your prescription details.
Why appearance alone is not enough to identify sildenafil
Many different medications come in blue diamond shapes, round white tablets, or other common forms. Color and shape alone cannot tell you whether a tablet is sildenafil, a different medication, or something else entirely. The imprint is the only marking that uniquely identifies a tablet's contents.
If someone gives you a tablet and tells you it is sildenafil, but you cannot verify the imprint, you have no way to confirm that claim. This is why it is important to obtain sildenafil only from a licensed pharmacy where a pharmacist can verify what you are receiving.
What to do if you cannot identify a sildenafil tablet
If you have a tablet you cannot identify, take a photo of both sides and bring it to your pharmacy. The pharmacist can look up the imprint in their database and tell you exactly what the tablet is, what dose it contains, and whether it is safe to take. This takes only a few minutes and is free.
Do not take a tablet if you cannot verify what it is. Even if someone you trust gave it to you, the only way to be certain of its contents is through a pharmacist or the FDA's pill identifier tool. If the imprint does not match any known product, the tablet should not be taken.
Frequently Asked Questions
Is generic sildenafil the same as brand-name Viagra?
Yes, generic sildenafil contains the same active ingredient and works the same way as Viagra. The FDA requires generic versions to be chemically identical and equally effective. The only differences are appearance, manufacturer, and usually price. Generic sildenafil is safe and legitimate.
Can I tell the dose of sildenafil just by looking at the color?
No. While brand-name Viagra is always blue and diamond-shaped, the color does not tell you the dose — all three strengths (25 mg, 50 mg, 100 mg) look the same. Generic sildenafil comes in many colors and shapes. The imprint is the only way to know the dose.
What should I do if my sildenafil tablet looks different than before?
If your pharmacy switched you to a different generic manufacturer, the appearance will change but the medication is the same. Ask your pharmacist to confirm the imprint matches your prescription. If the imprint is different or unreadable, do not take the tablet until your pharmacist verifies it.
Where can I look up a tablet imprint to verify it is sildenafil?
The National Library of Medicine's pill identifier tool (accessible through the NIH website) allows you to search by imprint, color, and shape. Your pharmacist can also look it up when ready. If the imprint does not appear in any database, the tablet may not be a legitimate pharmaceutical product.
Is it safe to buy sildenafil from an online pharmacy?
Only if the online pharmacy is licensed in the United States and requires a valid prescription from a doctor. Pharmacies that do not require a prescription or that ship from outside the U.S. have a high risk of selling counterfeit products. Stick with pharmacies you can verify through your state's pharmacy board.