Small amount of atropine is added to diphenoxylate because
Atropine is an anti muscarinic drug diphenoxylate is an opoid drug which when given has propey of abuse hence atropine is added to it aas the anti muscarinic side effects of atropine will decrease the abuse of the drug. ReF:KDT 6/e p664
Suppress vomiting in gastro enteritis
Increase anti motility action
Block side effects of diphenoxylate
To decrease abuse of diphenoxylate
All India exam