Graves' Disease Support Group
Graves-Basedow disease is a medical disorder that may manifest several different conditions including hyperthyroidism (over activity of thyroid hormone production), infiltrative exophthalmos (protruberance of one or both eyes and associated problems) and infiltrative dermopathy (a skin condition usually of the lower extremities). This disorder is the most common cause of...

Please do not worry over missing a dose here and there. It has happened to me many times over the past 15+ years that I have been on the MMI (Methimazole).
From what I have read on the few thyroid forums/boards that I have been on and moderated, this is actually quite common to miss a dose. :-)
{{{hugs}}}