Can hot weather increase side effects whilst on propranolol or doesnt it have an impact? also can i eat / drink caffeine ? so chocolate and cola?

Side effects are not typically dependent on the weather. Immediate release tablets can be taken on an empty stomach, extended release capsules can be with or without food. The only food considerations are broccoli, alcohol, herbals, and theophylline derivatives (which includes caffeine)

This answer Depends on what side effects you are experiencing with this medication, so adding some context is necessary. You can consume some caffeine if you tolerate it fine.

You don't mention why you're taking propranolol. For hypertension? For arrhythmia history? Side effects include slow heart rate, low BP,fatigue, cold extremities, sleep disturbances and hot weather shouldn't be much of an issue. Caffeine or chocolate excess can aggravate or cause hypertension and arrhythmias.in some people.