You should not use Inderal if you have asthma, very slow heart beats, or a serious heart condition such as "sick sinus syndrome" or "AV block" (unless you have a pacemaker).
Before taking this medicine
You should not use Inderal if you are allergic to propranolol, or if you have:
asthma;
very slow heart beats that have caused you to faint; or
a serious heart condition such as "sick sinus syndrome" or "AV block" (unless you have a pacemaker).
To make sure Inderal is safe for you, tell your doctor if you have:
a muscle disorder;
asthma, bronchitis, emphysema, or other breathing disorders;
low blood sugar, or diabetes (propranolol can make it harder for you to tell when you have low blood sugar);
slow heartbeats, low blood pressure;
congestive heart failure;
depression;
liver or kidney disease;
a thyroid disorder;
pheochromocytoma (tumor of the adrenal gland); or
problems with circulation (such as Raynaud's syndrome).
FDA pregnancy category C. It is not known whether Inderal will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant while using this medicine.
Propranolol can pass into breast milk and may harm a nursing baby. Tell your doctor if you are breast-feeding a baby.
 Inderal pregnancy and breastfeeding warnings (more detail)
