Can Weight Gain Be Side Effect Of Adco-retic?

I'm on a low GI diet and I exercise 4-5 days a week. My exercise is varied so it's challenging each day. For the past year I've been losing weight steadily. Last month I started taking Adco-retic for hypertension & water retention. I've noticed that since I started taking this medication I'm gaining some weight. Is my weight gain a side effect of this medication?