I tried looking this up, and they don't say anywhere what they mean by prescription. Mine are 90 days, so I want to assume thats normal but don't honestly know. Looking up dosing it seems that 3x300mg is as small as is prescribed, and it can go up to 3x1200mg.

Then we have the increase in incidence. The incidence rate is already small in those age groups, so even doubling it is a tiny number.

I'm going to stop taking it (I take something between 1/10 and 1/5 of my prescribed dose anyhow) and think about if the benefit to me is worth the added risk.