[swatsurgeon]

WD,
you posed a rather difficult question for a lot of reasons....the majority of people taking any prescription medicine have at their disposal less than a 30 day supply due to the ironic/stupid/ignorant decisions made by insurance companies, pharmacies and other unknown entities to have patients continue to make "co-pays" and keep the money coming in. It was a recent phenomenon to be able to get a 90 day supply but after 2 1/2 months, your stock is down to 15 pills and you are too low in inventory for an emergency situation for a potentially life saving medication. People are generally not "allowed" to refill too soon (arbitrary!!) so no long term meds available typically.
To answer specifically, a few herbals that are weak replacements but nothing that would sustain hypothyroidism for too long...you do need synthroid. My best advice is always get 90 day supplies and shave off 10 pills each time, rotate stock to keep it 'fresh' which brings me to another point of "expiration"...few meds deteriorate that quickly. by the way it takes 2 weeks or so to deplete your thyroid hormone effect stores so if he skipped everyother day he might feel alittle tired and slower but would be okay for a prolonged period of time.
Moral of the story, it is up to each patient to figure out a way to keep 30 days around at all times..more if possible for just such an emergency. Most meds can be obtained within 30 days for sure, 2 weeks maybe, 3 days rarely.

ss