Thanks for writing your query.
Toprol xl metoprolol
succinate is a beta-1 selective adrenoceptor blocking agent.
Different anti-hypertensive drugs have different mode of action.There any patient can not use any anti hypertensive drug themselves,they must be prescribed by a doctor.
So i would suggest you consult a doctor and get thorough examination done for neck spasm
If neck spasm is because of this drug he will change the drug,if not then your doctor will let you know and you can continue this medicine.
Hope this will be helpful.
Dr. Gunjan Gupta