Erectile dysfunction could be a problem to a number of men. Common causes of erectile dysfunction are obesity, high blood pressure and high levels of cholesterol. Viagra is a medicine commonly used to treat sexual dysfunction. It works by inhibiting phosphodiesterase-5 enzyme therefore preventing the degradation of cGMP, an enzyme that regulates blood flow to the penis. The result is relaxation of the blood vessels supplying the penis leading to an erection. Viagra can also be used in the treatment of pulmonary arterial hypertension.
GENERIC AND BRANDED MEDICATION.
New drugs are usually developed by different pharmaceutical companies. Patents are used by these companies to protect these innovations for a limited period of time usually 20 years. When this period is over other pharmaceutical companies are also allowed to manufacture and sell the generic variations of the branded drugs. In this case, Viagra was invented by the Pfizer pharmaceutical company. The patent on the drug expired in June 2013 and other pharmaceutical companies were then allowed to manufacture the drug. Sildenafil is the generic version of Viagra. It is cheaper because it is not branded like its generic counterpart. However both Viagra and the generic Sildenafil are same in that they both contain the same active ingredient, that is sildenafil citrate. They also have the same quality,strength, stability and effectiveness. Therefore the only difference between branded Viagra and generic sildenafil is that one is branded and the other is not.
HOW IT IS TAKEN
Viagra is taken orally about one hour before sexual activity. One is advised to take it on an empty stomach. It should not be taken more than once per day. The doctor usually prescribes the doses and the drug and it is recommended that one follows all the directions given. The drug is formulated in tablets equivalent to 25mg,50mg and 100mg. 50 mg tablets are used by those patients who have never used sildenafil before,100 mg taken by patients who have used sildenafil more than four times before and did not achieve the effect they desired effect, while 25 mg tablets are used by those patients who have taken sildenafil before and suffered serious side effects.
One is advised not to take any grapefruit while taking Viagra because they interact causing various side effects. Alcohol should also be avoided.
DRUG INTERACTIONS
Never take Viagra in combination with other drugs that treat sexual dysfunction. You should inform you doctor of your medical history so that he can advise you appropriately. Viagra also interacts with HIV /AIDS drugs, tuberculosis drugs, antibiotics such as erythromycin,anti fungal drugs, and anti seizure drugs. It also interacts with other drugs that are not mentioned so be sure to talk to your doctor first.
SIDE EFFECTS
A number of patients usually are allergic to sildenafil and this allergy is accompanied by a number of symptoms for example swelling of the face lips and throat and difficulty in breathing. When one experiences these symptoms they should see a doctor immediately! Viagra also causes priapism, that is, a prolonged erection that lasts more than four hours. Priapism can cause damage to the penis.
Other common side effects of Viagra include nausea and vomiting, diarrhea, headache and stomach ache.
The rare side effects include bladder pain, bloody urine, burning feeling in the chest,increased frequency of urination, abnormal vision, bleeding in the eyes, anxiety and dry mouth.
Viagra and sildenafil are only prescription drugs and are not sold over the counter. You can buy cheap Viagra without prescription online. Different companies sell these drugs at different prices.
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I am self employed. General Practitioner in Melbourne, VIC. My special interest: male reproductive system.