Hi Arun,
Thanks for sharing your success of finding relief for your POIS symptoms, and thanks for adding a caution note about the use of propranol ( Inderal), which apply to any other beta-blocker as well.
Propranolol, as all beta-blockers, has the properties of slowing and steadying the heartbeat ( technically, they are class II anti-arrhythmic agents ). As you have rapid and strong heartbeat when in POIS, it can be of help for sure, and I guess that this rapid and strong heartbeat may be linked in your case with some high blood pressure ( did you ever measure your blood pressure during a POIS episode ? How was it ? ). You also think you have a kind of cardiac arrhythmia, that would also acccount for the relief you get from a beta-blocker.
As I have written in another thread, those who have hypotension ( low blood pressure) as a POIS symptom, like myself, should not try beta-blockers, as they can worsen the hypotension.
Another effect of beta-blocker is that they block a type of adrenaline/noradrenaline receptors ( not just in the heart tissues), so it could help somewhere else in the body if too much noradrenergic tone is caused by POIS, which may be manifested by your very tense muscle and muscles spasms ( just a hypothesis here, I cannot know if this is what happens in reality... but beta-blockers stabilizing muscles tremor, they are even considered as doping in pool and snooker ocmpetition). I point that in order, maybe, to help screen what POIS sufferer could benefit from beta-blockers. So, if POIS causes rapid, strong heartbeat, with higher blood pressure, and muscle spasms, that would be a sign the beta-blockers could be of help, when taken at low dose ( 10mg of propranolol is a low dose. betablocker are very potent drugs. If taken at 25mg or more, I guess it may do more harm than good, as pressure would get quite low )
As Arun says, you have to consult your physician before taking propranolol. Anyway, it is a prescription only drug.
This post about beta-blockers tends to confirm that POIS is not a unique syndrome, but a family of syndrome having the same trigger ( ejaculation), and that there will not be one, unique treatment for all POIS cases. In my case, beta-blockers would worsen my symptoms, but propranolol is clearly of help for you, Arun.
Thanks again for taking the time to share those data.