The doctor gave him some medicine and told him to rest.
Is it because of the medication?
Yes, the medicine helps him with the pain
He should follow the doctor's orders. Doctor's know what they are doing when prescribing medication.
He's my friend, I think it's okay to let him relax with some prescribed substances.
As long as he follows the medication's guidelines, I think your friend will be okay. Is there anything you can do to help your friend out while they recover? Maybe you can surprise them with a meal or a special treat of some sort.