DIPHENOXYLATE HYDROCHLORIDE AND ATROPINE SULFATE IS NOT RECOMMENDED FOR CHILDREN UNDER 2 YEARS OF AGE. Diphenoxylate hydrochloride and atropine sulfate should be used with special caution in young children because of the greater variability of response in this age group. See WARNINGS and DOSAGE AND ADMINISTRATION.
Similarly, nerve damage in the arm can cause numbness. This may include damage to the nerves in the arms, shoulder, neck, or spine. This could be the result of blood circulation being interrupted or a nerve becoming compressed.
8. A Brain Tumor Is a Rare Cause of a Numb Arm. Relax -- brain tumors are quite unusual. While it's important not to panic at the first sign of a numb arm, it could be caused, in some very rare cases, by a brain tumor. A brain tumor can cause loss of sensation and movement in an arm.