Inderal Side Effects. Severity: Major. You should check with your doctor immediately if any of these side effects occur when taking propranolol:
More common: – in children:
Cough producing mucus
difficulty with breathing
tightness in the chest
Incidence not known:
Abdominal or stomach pain and tenderness
black, tarry stools
blistering, peeling, or loosening of the skin
blood in the urine
bloody nose