I got all sorts of side effects soon after starting the same tablets - but I persevered for another month and got really bad - but I could not report them as I started and stopped two drugs on the same day - therefore no way to make a report, I was told. Probably why they are regarded as safe and effective, as the negatives are not even noted.
I did start to feel suicidal, and I was forgetful, unable to move around without pain, incontinent - I thought that I would soon be unable to function in a normal environment - then in a moment of lucidity I managed to deduce the reason.
I didn't need the tablets in the first place, so I have declined all attempts to get me to take them, and eventually got a note put on my record at the surgery to stop them calling me back to persuade me it was all in my mind.
By palpitation do you mean stopping for a beat or two ? I had that. It definitely started when I took the tablets, but did not stop for some months after. I thought that there was something wrong with the monitor.