Viagra is the trade name, generic name of sildenafil citrate tablets, this drug sometimes works sometimes does not work may be related to improper use of drugs, individual differences, drug quality and other reasons. 1. Improper use of medication: If the patient does not use the medication reasonably, the dosage of the medication is not enough, or the time of taking the medication is too early, too late, to a certain extent, the efficacy of the medication may be affected. 2. Individual differences: usually, it is considered because of their own sensitivity to sildenafil citrate tablets, so sometimes it works and sometimes it does not work. 3. Drug quality: if patients take sildenafil citrate tablets not within the shelf life, there may be drug failure, so the drug is occasionally ineffective after taking the drug. Sildenafil citrate tablets is a type 5 phosphodiesterase, which can be used to treat erectile dysfunction in clinic, and some patients may have adverse reactions such as headache, skin flushing and indigestion. Sildenafil is forbidden to be used in combination with nitrate drugs, and this drug is contraindicated in women, people who are allergic to this product, children, and people whose recent cardiovascular status makes them unfit for sex. To summarize, patients must take sildenafil citrate tablets under the guidance of a doctor, and if the drug is ineffective, you need to go to the hospital, and the doctor will change the drug treatment program.
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