Does Viagra have fake drugs?
Viagra is a prescription drug, which is only available in pharmacies. It is basically not fake to buy it in pharmacies. If you buy it, you must first confirm whether it is obtained in a regular hospital or a regular pharmacy. Authentic viagra? The back of aluminum-plastic packaging is printed with: Viagra? Chinese and English names (English Viagra) Pharmaceutical names (Sildenafil Citrate Tablets); Pharmaceutical factory (Pfizer Pharmaceutical Co., Ltd.); Authentic viagra? The outer packaging is exquisite cartons, bottled or bulk are fake. Viagra? There is a new laser anti-counterfeiting mark. Viagra is only available in regular hospitals and pharmacies, where it is generally not fake.
Does Viagra have a pack?
So how much is Viagra? At present, there are several kinds of packaging of Viagra, 1 capsule, 5 capsules,1capsule, and the corresponding prices are of course different. As long as you buy more, the price will naturally come down. At present, the market price of 1 tablet on the market is 128 yuan, while the price of five tablets is about 495 yuan, and the price of1tablet is even less, only 965 yuan.
Usage and dosage of viagra
Please use it under the doctor's diagnosis prescription and take it accurately according to the dose told by the medical staff. The medical staff will tell you the dosage and time. If necessary, the medical staff can adjust the dose. The following patient information is for reference only (US Food and Drug Administration, Viagra? Instructions, patient information; Pfizer China, instructions for Viagra):
Take it about before sexual activity 1 hour. If necessary, it can also be taken within 30 minutes to 4 hours before sexual activity. Viagra can be taken before or after meals. If you take it after a high-fat meal (such as hamburgers or French fries), it may take a little longer for the drug to take effect. Do not take Viagra more than 1 time a day. If you accidentally take too much Viagra, contact your doctor immediately or go to the nearest hospital emergency room.
For most patients, the recommended dose is 50 mg, which is taken on demand about 1 hour before sexual activity; But you can take it at any time within 0.5-4 hours before sexual activity. According to the efficacy and tolerance, the dose can be increased to 100 mg (the maximum recommended dose) or decreased to 25 mg. Take 1 time at most every day. The recommended dose of sildenafil has no effect without sexual stimulation.
The following factors are related to the increase of plasma sildenafil level (AUC): age over 65 (increased by 40%), liver damage (such as liver cirrhosis, increased by 80%), severe renal damage (creatinine clearance rate [30ml/min, increased by 100%), taking powerful cytochrome P4503A4 inhibitors [ketoconazole, itraconazole] Because higher plasma levels may increase both the efficacy and the incidence of adverse events, the initial dose of these patients is 25 mg.
A study in healthy subjects without HIV infection showed that ritonavir could significantly increase the blood concentration of sildenafil (AUC increased 1 1 fold, see "Drug Interaction"). In view of this, it is recommended that patients taking ritonavir at the same time take no more than 25 mg every 48 hours.
Sildenafil can enhance the hypotensive effect of nitrate, so patients who take any form of nitric oxide donor and nitrate are forbidden to take sildenafil.
When it is necessary to use sildenafil in combination with alpha blockers, before sildenafil treatment, the patient has been treated with alpha blockers and reached a stable state, so sildenafil should be taken from the lowest dose (see drug interaction).
Contraindications to taking Viagra
You'd better not take medicine immediately after taking a shower.
Some people may not succeed in taking Viagra for the first time. You can adjust the dosage and try it many times at the same time. It is generally recommended to try about 4-6 times to achieve the best results.
Some young people of childbearing age, due to the pressure of life, work and childbirth, will cause ED during ovulation, that is, erectile dysfunction will occur during planned pregnancy. At this time, you can successfully complete the fertility task by using Viagra.
If you have heart disease, stroke, retinitis pigmentosa, nephropathy, liver disease, blood disease, penile malformation, etc. Be sure to consult an expert before taking it.