Viagra and Cialis are both drugs used to treat erectile dysfunction (ED) in men.

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Guía de Salud Masculina

  1. 1. Mechanism of Drug Action
  2. 2. Precautions for drug use

1. Mechanism of Drug Action

1、same point

Viagra and Cialis are both drugs used to treat erectile dysfunction (ED) in men.

- Both belong to phosphodiesterase type 5 (PDE5) inhibitors. By inhibiting the activity of PDE5 enzyme, they reduce the degradation of cyclic guanosine (cGMP), thereby relaxing the smooth muscle of the corpus cavernosum of the penis and flowing blood into the penile tissue. Promote erection of the penis.

2、different points

action time

Viagra: Sildenafil has a relatively short action time. Under sexual stimulation, it takes effect about 30 - 60 minutes after taking it, and the effect can last for about 4 - 5 hours.

Cialis: Tadalafil has a long time of action. It is called a "long-acting" ED treatment. It takes effect within 30 minutes to 6 hours after oral administration and can last for up to 36 hours.

2. Precautions for drug use

1、applicable population

- It is mainly suitable for male patients with erectile dysfunction, but needs to be used under the guidance of a doctor.

2、contraindications

- Both are contraindicated in patients who are taking any form of nitrates (such as nitroglycerin, isosorbide mononitrate, etc.) because combination use may cause severe hypotension.

- It is prohibited for those who are allergic to drug ingredients.

3、adverse reactions

Viagra: Common adverse reactions include headache, facial flushing, indigestion, nasal congestion, visual abnormalities (such as pale vision, enhanced light perception, or blurred vision, which is relatively rare), etc.

Cialis: Adverse reactions are similar to Viagra. Headache, indigestion, facial flushing, back pain, myalgia, etc. may also occur, but the incidence of visual abnormalities is relatively low.

These drugs are prescription drugs and should not be administered on your own without medical supervision.


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