Final answer:
In hypertrophic cardiomyopathy where B-blockers do not work, other medications such as calcium channel blockers and anti-arrhythmic drugs can be used.
Step-by-step explanation:
In the case of hypertrophic cardiomyopathy where B-blockers do not work, other medications that can be used include calcium channel blockers and anti-arrhythmic drugs.
Calcium channel blockers such as diltiazem or verapamil can help relax the heart muscles and improve blood flow.
Anti-arrhythmic drugs such as amiodarone or disopyramide may be prescribed to control abnormal heart rhythms.
However, there are medications that should be avoided in hypertrophic cardiomyopathy, such as medications that increase contractility of the heart or medications that can cause further obstruction of blood flow, like digitalis or sympathomimetics.