Vigora 100mg tablet is a medication used to treat erectile dysfunction (ED) or impotence in men. It contains sildenafil citrate as its active ingredient, which works by increasing blood flow to the penis during sexual stimulation, thus helping men to achieve and maintain an erection. The tablet should be taken orally with water, preferably 30 minutes before sexual activity. It should not be taken more than once a day, and it is important to consult a doctor before using this medication. Possible side effects may include headache, dizziness, flushing, nausea, and blurred vision. The 100mg strength is a standard dosage and may be prescribed for men who require a moderate dose.