I had a very low pulse when taking both infusions, ( only 40, 42 beats per minute when having infusions.....BP on the lower side of normal for me). They did an EKG on the third day of infusions, RD1.....my neuro said it looked fine, and I continued with tx......) Only other thing I noted was a little heavy chest feeling and slight difficulty breathing (used albuterol inhaler once the third day of RD1, did not use RD2)....slept propped up. As soon as infusions were done, I did not have those issues...

Thank you for replying I had the opposite effect my heart rate went to 180 bpm and they did an ECG as well I continued with treatment with more observation but I do think my irregular heartbeat now is linked to the Lemtrada my GP did check me over and reckons it is minor but I was just curious if it was a common side effect of the treatment but in all other aspects this treatment is working brilliant for me I can even keep up my 5yr old!! She can't out run me anymore!! 😁😁😁