Originally Posted by
Beaker
Those kind of adverse reactions are on the very rare side,
Rare, yes. Possible,yes.
Originally Posted by
Beaker
also the majority of drugs one can take get metabolized by the liver in some way, shape or form - that's it's job. .
That is the livers job. Unfortunately, when on occasion an element is introduced that the body rejects, the liver takes the brunt of it causing the downline side-effects.
Originally Posted by
Beaker
Given that the OP notes that he is new to cycling, and only recently did his first century at a slow pace, I'll put a wad of cash on this being good old under training for the intensity/effort of the ride. Classic cause of cramp from what I've seen, read and experienced. Just ramp the mileage up and you'll become accustomed to riding longer and faster.
This is probably correct but unusual symptoms should never be ignored. I did have a drug reaction that manifested itself in the same way and with sudden and severe leg cramps. Once you got off the bike they almost immediately went away. This is a known side effect of the drug. Rare or not, it is possibly ( Note the first word in my response to the op) the cause.