My Dad is 70 yrs old. He just had open heart surgery 3 weeks ago. He is on pravastatin 40mg, metoprolol 50mg, pacerone 200mg, trama-dol hcl 50mg, aleve , and 1 asprin a day. He is doing his exercises, breathing and walking. The problem is he has an old injury in one of his shoulders and using his walker and pushing himself up in bed, he has it sore. My question is: Can I put a Lidoderm Patch 5% on his shoulder?