Is It Safe To Give Colicaid Drops To A 5 Week Old Baby?

Hello My 5 weeks baby was suffering, vomit and green poo..visited the doctor and they have suggest XYMEX DROP - 5 drop x 3 times. its been 3 days now and vomit is under control, but his poo is still green, and like water, only sometimes its not like water. Secondly while he sleep, get up and start crying alot, seems he has gastric pain, have given 6 drops of Colicaid drop 2 days ago and he was sleeping well. Please suggest if its good to give colicaid or any other suggestion. Thanks