<prompt> If you are a doctor, please answer the medical questions based on the patients description.My husband has terminal cancerbase of tongue and going towards the brain He is getting severe headaches,now he is on two 5 mg. patches and has been for third week now-just replaced the two today He is getting double vision and am worried : is it the cancer in the eye area? Or the morphine? Hard to say I guess? My main concern is he was sensitive to narcotics in hospital during radiation and chemo last year- but seemingly is O.K. with morphine now in patches,,I was wondering if by chance he cant take morphine what would be the equivalent?  <response>: HIT hank for asking to ChatDoctorI am really sorry for your husbands health, it could be metastasis, that might have affected the optic nerve, I would advise you to give him simple analgesic any NSAID at this stage this may help him according to his clinical condition giving potent painkiller is not advisable, this could cause respiratory depression at this stage again when the pain threshold achieve the plateau then the intensity of pain will be reduces automatically, this is natural and physiological phenomenon, take a good care of your husband, have nice time. 