I think the dr. will give a B1 injection if you are low. The liver uses B1 when it oxidizes alcohol so alcoholics are usually deficient...if not very deficient. Long term deficiency can lead to Wernekes. Which is horrid....my father has it.
So with the guidance of your Dr, why not? B vits are water soluble and are great for the CNS. But of course, your dr should be your guide in this.