Please do not start thiocolchicoside 8 mg on your own. It is not suitable for everyone and can cause drowsiness, diarrhoea and rarely seizures; the dose and duration must be decided after examination. For one day of neck spasm, a warm compress, rest and gentle movement are usually safer first steps.
Next Steps
Avoid driving if you take any sedating medicine. Seek urgent evaluation for weakness or numbness in an arm, trouble walking, severe headache, fever, injury or loss of bladder/bowel control. If stiffness persists beyond a few days, I can assess you through Practo or at Synergy Multispeciality Hospital, Miraj.