I am 53 no health problem, just take 300mg ziloric, ply tennis regurly, now a dayes after 1 set about 1 hour ply feel tired and muscle cramp wht to do?

Tireness. I am sorry but I have not being able to find ziloric in the largest drug reference that we use in medical practice the "pdr".Please check the spelling or at least tell what are you using it for, so I am able to tell is there is a relationship between ziloris and ypur tireness.