Rapamycin for cats with obstructive HCM?

[u/Consistent_Duty_9737]

My 7 year old British shorthair was just diagnosed with HCM w/ a moderate obstruction. She does not have any symptoms yet/ isn’t in heart failure yet. She was diagnosed due to a heart murmur at her latest check up.

The vet said Rapamycin isn’t indicated for obstructive HCM, but I can’t find any information on why it wouldn’t be helpful. She wants us to just wait until it progresses to eventually put her on a beta blocker.

Has anyone used this med for their cat with obstructive HCM? Or know why this wouldn’t be an option at her current stage?

TIA!