Taking three capsules of 5 mg tadalafil in a month is not significantly harmful to the body. Tadalafil belongs to the group of medications used to treat erectile dysfunction in men. This medication can be taken as needed before sex and up to once a day. It can also be taken regularly on a daily basis in a dose of 2.5mg to 5mg per day for about 3 months to reassess the condition. Therefore, there is no harm in taking 5mg tadalafil 3 times a month. Adverse effects of tadalafil include flushing, dizziness, headache, visual abnormalities, nausea, dyspepsia, etc. It is contraindicated in patients who are allergic to tadalafil and the drug should not be used in combination with nitrate drugs as hypotension may occur. It is recommended to take medication under the guidance of a physician in accordance with medical advice, not blindly.