If he's on a fentanyl patch, no it's not OK and would be deadly. Transdermal delivery systems for medications like fentanyl or Androderm etc are heat activated and will release medications as they heat up. If he's not on a transdermal, I've never heard of any other complications.

Hope it helps!

Eric

Young Frack, SCC T4N2M0, Cisplatin,35+ rads,ND, RT Mandiblectomy w fibular free flap, facial paralysis, "He who has a "why" to live can bear with almost any "how"." -Nietzche "WARNING" PG-13 due to Sarcasm & WAY too much attitude, interact at your own risk.