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All drugs have one or the other side effects. Vasograin
Side Effects include muscle cramp, stiffness
, nausea, vomiting, diarrhea. Weight gain as side effect is not been mentioned any were.
The weight gain is might be due to dietary or lifestyle changes in last few month.
I advice you to eat healthy and avoid outside food, more vegetable and fibers will be good than the meat. It is better to do some exercises regularly to reduce the weight.
Hope i have provided the information you needed.