Caverta 100 mg drugs are offered nearly at ten to ninety percent lower prices than the branded ones. Branded drugs are very expensive as the large portion of the cost of brand name drugs covers the high cost of research and development. But these drugs manufacturer only has to follow the same formulation of the branded drugs, thus the cost of research and development is saved by the generic drug manufacturer. Branded drugs spend the lot of money in the advertisement and the promotion of the drug as they are first to introduce the drug in the market. The cost of investment done by the generic drugs for the advertisement and the promotion is very less. As a result, generic drug manufacturers are able to sell the generic drugs at a very low cost in comparison to the branded drugs. Caverta is easily available in the market and they even do not require the prescription depending on the rules in the country in which you are buying them. But, please ensure before taking generic drugs to take the doctor’s advice regarding the dosage of the drug. Food and Drug Administration in United States has declared certain rules for the manufacturing of Generic drug which are generic must contain the same ingredient as the original drug; Caverta enables many men with ED to respond to sexual stimulation. When a man is sexually aroused, the arteries in the penis relax and widen, allowing more blood to flow into the penis. As the arteries in the penis expand and harden, the veins that normally carry blood away from the penis become compressed, restricting the blood flow out of the penis. With more blood flowing in and less flowing out, the penis enlarges, resulting in an erection. Like all medicines, it can cause some side effects. These effects are usually mild to moderate and usually don't last longer than a few hours. Some of these side effects are more likely to occur with higher doses. The most common side effects of Sildenafil citrate are headache, flushing of the face and upset stomach. Less common side effects that may occur are temporary changes in colour vision (such as trouble telling the difference between blue and green objects or having a blue colour tinge to them), eyes being more sensitive to light or blurred vision. Most, but not all, of these men had heart problems before taking this medicine. It is not possible to determine whether these events were directly related to Sildenafil citrate. Sildenafil citrate may cause other side effects besides those listed on this sheet. If you want more information or develop any side effect or symptom you are concerned about, call your doctor. What to tell your doctor before beginning Caverta pills. Only your doctor can decide if it is right for you. Online trading has given a new life to the sale of the generic drugs. Lots of positive publicity, best quality products, excellent customer service, and on time delivery has lead to the increase in the online sales of generic drugs.