CAFFEINE WITH MEDICATIONS

 I AM CURRENTLY TAKING 400 MG OF THEOPHYLLIN AND 400 MG OF NORPACE A DAY FOR AN IRREGULAR HEART BEAT. I AM WONDERING IF I CAN HAVE SMALL AMOUNTS OF CAFFEINE EACH DAY (1 CUP OF COFFEE OR 1 CAN OF DIET MOUNTAIN DEW) I AM NOT A BIG CHOCALATE FAN BUT ONCE IN A WHILE IS IT OKAY TO HAVE A CANDY BAR OR A CHOCALATE DESERT? I TRULY MISS THE CAFFEINE!!