Viagra (short for Sildenafil), commonly known as Viagra. It is used to treat erectile dysfunction (also known as impotence or ed) in men, effectively improving the hardness of penile erection. When using Viagra, you should pay attention to the following seven: First, do not easily change the dosage. “Viagra is available in three different dosages of 25mg, 50mg and 100mg. Physicians use the initial dosage according to the patient’s condition and then find out the optimal dosage. If the patient is older than 65 years, or has serious liver or kidney disease, it is necessary to start with the lowest dose (25 mg). Blindly increasing the dose of the drug may incur greater adverse effects and is not helpful in strengthening sexual function; decreasing the dose of the drug may not be effective. The second is to take it about 1 hour before sexual intercourse. In a state of sexual arousal, Viagra can help you achieve an erection from 30 minutes to 4 hours after taking it. The highest concentration of the drug in the body is obtained 1 hour after taking it, and this should also be the time when the drug is most effective, which can help the patient get the best erectile ability. Number three, take it on an empty stomach. It is best to take under fasting conditions or after 2 hours after meals, because the substance may affect the absorption and effect of the drug, if you take “Viagra” after eating high-fat food, it will take a long time to play a therapeutic effect. The fourth is the need for sexual stimulation. After taking Viagra, do not do nothing to wait for sexual desire, but to have sexual intercourse foreplay activities, including flirting with sexual partners, kissing, touching, etc., which can enhance sexual interest, feelings and hardness of erection; if there is no sexual stimulation, will not trigger a strong erection of the penis. Fifth, take it at most once a day. If you don’t get a satisfactory erection after taking Viagra, some men may choose to take additional medication rather than wasting a good time and spoiling the fun. This is not good, can significantly increase the risk of drug-induced, and may therefore incur unnecessary adverse reactions. Sixth, do not take nitrates. If Viagra is combined with any of the nitrate drugs, the patient’s blood pressure may suddenly drop to unsafe or life-threatening levels. Seventh, Viagra is not suitable for all people. A small number of impotent patients may not have any effect with “Viagra”; men who have serious adverse reactions and cannot tolerate sexual intercourse should not take the risk; healthy men with normal sexual function, taking “Viagra” will not add to your sexual function; “Viagra is intended for the treatment of erectile dysfunction in men only and is not suitable for use in children or women, and should not be taken by anyone else.