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"Pastillas de erección" (erection pills) are medications often used to treat erectile dysfunction.

1. Common types

- The most well - known is sildenafil (Viagra), tadalafil (Cialis), and vardenafil (Levitra).

- These drugs work by inhibiting the enzyme phosphodiesterase - 5 (PDE - 5). This inhibition allows for an increase in blood flow to the penis, which helps in achieving and maintaining an erection.

2. Usage and precautions

- They are typically taken orally. However, they should be used under medical supervision.

- There can be potential side effects, such as headache, flushing, nasal congestion, and in some cases, more serious cardiovascular effects. They are not suitable for everyone, especially those with certain underlying health conditions like heart problems or those taking specific medications (e.g., nitrates).

It is important to note that these medications are prescription drugs in most countries, and self - medicating without proper medical advice can be dangerous.