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Understanding the correct dosage strengths for Viagra and sildenafil is essential for safe, effective ED treatment. Both medications contain the same active ingredient but are available in multiple strengths to suit individual needs. This guide covers the standard dosages, starting recommendations, and how to adjust treatment based on response and tolerability.
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When PDE5 is suppressed, blood is able to flow more freely through the body—including to the (you guessed it) penis.

More blood flow to the penis means harder, more satisfying erections once you're sexually stimulated.
Both Viagra (branded) and sildenafil (generic) are available in three standardised strengths: 25mg, 50mg, and 100mg tablets. EverydayMeds offers both options, allowing patients to choose between the branded Viagra or the more cost-effective generic sildenafil at checkout. The active ingredient and clinical effectiveness remain identical between both formulations.
The MHRA-approved starting dose for most adult men is 50mg, taken approximately 30-60 minutes before anticipated sexual activity. This middle-strength dose provides an effective balance between therapeutic benefit and potential side effects. Clinical studies demonstrate that 50mg is sufficient for many patients to achieve satisfactory results whilst minimising adverse reactions.
Based on individual response and tolerability, the dose may be adjusted. If 50mg proves insufficient and is well-tolerated, the dose can be increased to 100mg (maximum strength). Conversely, if side effects occur or the patient is particularly sensitive, the dose can be reduced to 25mg. Factors influencing dosage requirements include age, overall health status, concurrent medications, and individual metabolism.
Regardless of strength chosen, never exceed one dose within a 24-hour period. Taking multiple doses can lead to dangerous drops in blood pressure and serious cardiovascular complications. The medication should be swallowed whole with water and can be taken with or without food, though fatty meals may delay onset of action.
Patients over 65 years or those with liver or kidney impairment typically require lower starting doses, often beginning with 25mg. Similarly, individuals taking certain medications such as alpha-blockers or some antifungals may need dose adjustments. Always complete a thorough medical assessment to determine the most appropriate starting strength for your individual circumstances.
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