Put me in the adverse side effect camp.
It started off well enough..... 30 min from home to Rite-Aid and back for the Pfizer vaccine. They did not ask me to wait 15 minutes after the shot. Mild arm soreness overnight.
The next day I was a little more fatigued than normal after the usual 3 hour ride.
Day three I went for a routine 1 1/2 hour run, all was fine.
The problem started on day four when I woke with unusually sore leg muscles, as if I had run a marathon and the pain got progressively worse each day there after.
As a long time endurance athlete, I have never experienced muscle pain like this.
Over the counter pain meds did not help, so I tried 50mgs of Tramadol. Still no relief.
200mg Celecoxhib (Celebrex) 2x/day helped a little.
8 days after onset, the pain concentrated in my left leg only, then consolidated to the mid quadriceps area where it is now at 11days and counting, weird.
I will not be getting the second dose!