Lip jerking and tongue biting

I have been on rebif 44 for 9 weeks.  Two weeks ago I started biting my lip. I noticed that my jaw is jerking which makes me bite my lip.  Also started biting tongue.  It is like my tongue does not know where it is.  Does anyone else have this problem.  I am taking the rebif for ms.

[Dr Sharma]

Dear Neesie, welcome to medhelp forum. I can understand your problem and empathize with you. You are taking rebif, which is interferon beta-1a used for relapsing MS. you could be suffering from jaw muscle spasms causing tongue and lip bites. You may be experiencing numbness in the tongue, a common symptom of multiple sclerosis per se. Review with your neurologist if your disease spectrum has changed and for these newer symptoms. He might like to add some muscle relaxant like tizanidine, baclofen or carbamazepine.
You are welcome with any further clarifications. God bless.

[Neesie51]

Thank you for your quick response.  I did think maybe new symptoms from the ms.