I have been on Clarithromysin for 14 days now for treatment of pneumonia and will come the drug one more day.  After the 7 th day of the drug I sustained muscle strains of the back (sides and along the vertebrae) and I have also had elevated heart, and SVT on two different days (once being admitted to the ER and other I had Metoprolol to address the problem.  Question:  Are muscle spasms, elevated heart rate, and possibly the SVT attributable to the drug.  I have never had SVT before and I am age 53.  Thank you.
Thanks for your question on Chat Doctor. I can understand your concern. No Clarithomycin can not cause muscle spasm. Clarithomycin has no cardiac side effects, so SVT is not due to Chat Doctor.  So better to consult cardiologist and get Holder monitoring to find out cause for SVT. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.