Over time, the phenobarbital may speed up how quickly your liver processes your pain medicine. Initially, you could have more side effects from both medicines, but after you have been on the ...

When taken by mouth, phenobarbital can stay in the body for ... or a barbiturate—primidone—as a first-line medication for essential tremors. However, many people will not respond to either ...

For patients not taking carbamazepine, phenytoin, phenobarbital, primidone, or valproate: initially 25mg once daily for 2 weeks, then 50mg once daily for 2 weeks, then 100mg once daily for 1 week ...