Many of my coworkers have been vaccinated using the AstraZeneca vaccine developed in the UK.
I dont know how effective it is, if at all, but half of them had to stay home due to high fever and muscle ache. One managed to come to the office, but after a couple of hours passed out and had to be taken to the hospital. Others were feeling drowsy and in need of sleep.
They are supposed to get another shot in a couple of months and the ones who live alone are planning to spend that night with friends or relatives, because many couldn't even move.