Everyone knows Viagra, but if you really have erectile dysfunction, there are millions of Viagra. How should you choose the one that suits you best?

The main ingredient that plays a role in Viagra is the PDE5 inhibitor PDE5I, but there is no clear evidence that any type of PDE5I has obvious benefits. The choice of medication is mainly based on the frequency and preferences of sex life, yes, it is so deliberate.

1. Tadalafil

Tadalafil is a long-acting PDE5I, the common scientific name is "Xiali". The start time is 30 minutes and the action time can take 36 hours. It can be taken before and after meals. This medication has a different effect. Daily use has a therapeutic effect on lower urinary tract symptoms due to BPH and is therefore particularly suitable for patients with ED and lower urinary tract symptoms. The single doses are 10 mg and 20 mg. For patients who want to have an erection at all times or who have a high frequency of sex, you should promote the use of 5 mg tadalafil for a certain period.

2. Sildenafil

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Sildenafil is the world's first oral PDE5I. Its common scientific names are "Viagra" and "Jinge". It is also most familiar to male friends. The start time is 30 to 60 minutes and the longest action time is 12 hours. Eating indigestible and high-fat foods can affect absorption and reduce the effectiveness of sildenafil. The usual doses of sildenafil are 25 mg, 50 mg, 100 mg, and the recommended starting dose is 50 mg, which can be adjusted at any time depending on the treatment.

3. Vardenafil

Vardenafil takes 30 minutes to work. Similar to the pharmacokinetics of sildenafil, the consumption of indigestible and high-fat foods affects absorption. The usual doses are 10 mg and 20 mg.

Four, Avanafil

Avanafil is a highly selective PDE5I. The starting time of a 100 mg dose can only be 15 to 30 minutes, and the highest frequency is once a day. Research to date shows that Avanafil has fewer side effects than the other three, but clinical trials are ongoing in China.

Although the four “Nafei” brothers in the Viagra family can relieve or treat ED, they are not without side effects and everyone can take them casually. The most common side effects are headache, facial flushing, indigestion, nasal congestion and sometimes dizziness, back pain and vision problems. In addition, taking Viagra is not recommended if people taking organic nitrates and nitrate medications to lower blood pressure will experience myocardial infarction, shock, or life-threatening arrhythmia in the near future.

Although Viagra is strong, it is not foolproof. If taking Viagra at a critical time has no effect, it may be due to abnormal sex hormones, food-drug interactions, wrong time, drug frequency and dosage, insufficient sexual stimulation, and alcoholism.

This is the Viagra that we see often. Do you understand?

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