Application of Viagra to treat premature ejaculation: 1, pay attention to the application dose of Viagra. There are three kinds of dosage of Viagra, 25mg, 50mg and 100mg respectively, and the first time you apply Viagra, you should start from the low dosage, 25mg or 50mg, and if there is only 100mg tablet, you can apply it twice or four times separately. 2, you should apply Viagra thirty minutes to two hours before the sex life. 3, before the sex life, there should be sufficient sexual stimulation, that is, what is usually called foreplay should be well prepared. 4, the most important thing you should pay attention to is not to combine with other drugs, especially the antihypertensive drug, which is the most important thing. The most important thing to pay attention to, is to try not to combine with other drugs, especially the nitroglycerin drugs that lower blood pressure. The application of nitroglycerin drugs and Viagra combined, may cause low blood pressure state, life-threatening. In addition, when applying Viagra, it is necessary to pay attention to adjusting and treating the causes of premature ejaculation, such as psychological factors, bad habits and hobbies. If the quality of sexual life is improved by making adjustments and treatments from the causes, the dosage of applying Viagra can be reduced, or at the end of the day, the problem of premature ejaculation can be dealt with without Viagra.