Paraspinal spasm will relieve with painkiller and muscle relaxants... No literature to suggest avoiding muscle relaxants after taking covid vaccine...if you are too worried then local analgesic creams can help you
Tab Zerodol-Th (Acleclo+Thiochoici)1 BD for 3 days
Volitra APS spray for LA
Start heat (warm water) compression it will help
...you should be fine with these
Next Steps
avoid heavy weight lifting
Health Tips
if prblm persists consult nearest orthopaedic surgeon or contact me via practo... thanks