Thats a tough question. Its better to just order some new stuff WHEN you have the money or time. You can get medicated fenebadazole flakes from angelsplus.com for like 5.00 enough to last a couple years about how long most meds last. Some can become toxic if their too old.
That's actually where I got it last time. My only issue with it was that the expiration date was sooner than on what it said on the listing. I'm a little Leary of ordering it from eBay again. Maybe I'll try Amazon this time.