I just switched over from tablets e 205 5mg methimazole to b p 655 tablet 5mg tablet methimazole . what is the difference between the two tablets.

Same medication: Sounds like the medication and dose is the same between the two tablets, it's most likely just different manufacturers making the same generic medication. Each manufacturer uses different codes on the tablets to help identify them. The medications should work the same as each other.

Same: E205 is made by sandoz pharmaceutical. Bp655 is made by bopca pharmacal, inc. Both are the same Methimazole concentration of 5 mg.