18 male just started lanzeprazole and i've been constipated for 7 days now should i be worried and what should i do, have had some bowel movement but been really small like one or two pellets and this has only happen twice?

Measures to prevent constipation include drinking plenty of fluids & eating fiber like vegetables & fruits or taking something like Metamucil daily. Regular exercise is important. If you don't have the urge for a bowel movement, take a gentle bowel stimulant like SenokotS daily per instructions. Try to avoid taking laxatives regularly. If you have an urge but can't go, insert a dulcolax rectal sup