Taking 20 mg tadalafil without a prescription is illegal and dangerous in most countries.

1. Legal reasons

-Tadalafil is a medicine used to treat erectile dysfunction and other related urological disorders. It is a regulated substance, and a medical prescription is required for its legitimate acquisition. This is because it must be prescribed and controlled by a health professional to ensure its proper and safe use.

2. Health risks

Drug interactions: may interact with other medications that a person is taking, such as antihypertensive, platelet antiaggregates, or heart medications. Without proper medical supervision, dangerous interactions can occur.

Uncontrolled side effects: may cause side effects such as headache, dizziness, blurred vision, nausea and, in rare cases, changes in blood pressure. A doctor should evaluate whether a patient is a suitable candidate for this medication and monitor their response to minimize these risks.

Medicines without a prescription should not be purchased or consumed, and in the event of related health problems, a doctor should be consulted for proper diagnosis and legal and safe treatment.