The appropriate dosage of Vigora 50 mg (sildenafil citrate) for an individual is determined by several factors, including:

1. Severity of Erectile Dysfunction (ED): The severity of a person's erectile dysfunction can influence the dosage of Vigora prescribed. For individuals with mild to moderate ED, a lower dose like Vigora 50 mg may be sufficient. However, those with more severe ED may require a higher dose.

2. Overall Health Status: A person's overall health status, including any underlying medical conditions they may have, can affect the dosage of Vigora prescribed. Certain health conditions may require dosage adjustments or contraindicate the use of sildenafil altogether.

3. Response to Treatment: Some individuals may respond well to lower doses of Vigora, while others may require higher doses to achieve the desired effect. The initial dosage is often based on how a person responds to treatment.

4. Age: Age can influence how a person metabolizes medications. Older adults may metabolize drugs more slowly, which could affect the dosage needed to achieve the desired effect.

5. Medication Interactions: Certain medications, especially those that affect liver enzymes or blood pressure, can interact with sildenafil and influence its effectiveness or increase the risk of side effects. A healthcare provider will consider any medications the individual is taking when determining the appropriate dosage of Vigora.

6. Tolerance: Some individuals may develop tolerance to sildenafil over time, requiring higher doses to achieve the same effect. However, it's important to avoid increasing the dosage without consulting a healthcare provider.

It's crucial for individuals to consult with a healthcare provider to determine the appropriate dosage of Vigora based on their individual health status, medical history, and other relevant factors. Dosage adjustments should only be made under the guidance of a healthcare professional to ensure safety and effectiveness.