Viagra is the trade name, generic name of sildenafil citrate tablets, eighty-year-old men with indications for the use of medication can be taken under the guidance of a physician. Sildenafil citrate tablets are commonly used in the clinical treatment of erectile dysfunction in men, and there is no restriction on the use of older men, so older men with indications for use of the drug (including those in their eighties) can use the drug, but the starting dosage for those over 65 years of age should be reduced. Note that the drug should be contraindicated in people who are allergic to the product, currently taking guanylate cyclase agonists (e.g., leucovorin), or during a carbon monoxide donor period. Elderly men with heart problems should use the drug with caution. Possible adverse effects of the drug include hot flashes, myalgia, back pain, nasal congestion, headache, dyspepsia, abnormal vision, rash, nausea, and dizziness. Specific use of the drug in question should be under the supervision of a specialist.