Mix of state (actual delivery) and federal law (HIPAA and OBRA)
Nevada, you have to deliver to either the person, or someone authorized to take delivery (caretaker, person at desk). You will need a signature. You cannot just leave it somewhere. It has to be signed. Will depend on your state. You can leave it with neighbor if patient authorizes it.
OBRA states you HAVE to provide counseling on new meds and on anything you (pharmd) think is relevent to protect the patient. In Nevada I can do it in writing IF the medication is to be delivered. Otherwise, all other counseling must be done verbally. To protect myself, I usually call at dispensing and try to provide counseling over the phone, but to be honest I only do it to give me a peace of mind. Will depend on your state.
HIPAA gets complicating. Most people that request delivery have already signed the HIPAA logs. Obviously if they havent, you have to make them aware of their rights in writing. However, there is a provision on the actual HIPAA log for other people to sign on behalf of the patient (parent, caregiver, or other, etc). Next time you see patient, you still have to get them to sign the log, and have them made aware of their rights.