Not seen the ad. A lot of old people with bad arthritic joints/chronic pain are in no shape to take the non-steroidal-anti-inflammatory-drugs or NSAID's
without blowing a bleeding ulcer, dorking their liver or kidneys and dying in misery. Some also are in too bad of shape to undergo major joint surgery.
If that's the case, the evil narcotics are the only choice. They won't dork major organs and only problems are constipation, falls, drowsiness and tolerance.
If they're careful with dosing, the side effects can be manageable. Only problem is grandma's teenage grandaughter or great grandaughter might pilfer the narcs to get high or to sell. So the caution to keep tabs on the meds. Kurt