Generally, I am wondering if this wormer remains viable beyond the stated expiration date, as so many products do. After ransacking the house, just found the Ivomec Eprinex that I have on hand. It's in a little brown glass vial where I hand wrote an expiration date of 2/09. I had given the original bottle and most of its contents to someone a couple of years ago who had a need for it and just kept a wee bit in case I needed it at some point. Now I think I need it because my roo feels too lightweight (he is otherwise eating and drinking and looking well). I realized his weight was too light when I picked him up to coat his legs/feet with Bagbalm as they were looking a bit scaly. It's the first time I've been able to pick him up since March because I've been in casts for fractures, so in the interim my poor sweet boy seems to have lost some weight. I wanted to ask the company if the product would still be viable but it's Saturday and they're only open only Monday to Friday. You can't get the stuff around here (only Wazine is available and that would do if the problem is roundworms I suppose) so if I have to order more it's going to take some time to arrive by mail. As a minor temporary measure I put food grade DE in their food and offered pumpkin seeds but if he has a serious worm infestation I need to call in the big guns (the Ivomec Eprinex). BJ's hen friend Ellie weighs plenty so I don't think she has a problem, interestingly. Will also have to refresh myself on dosage. Will try searching BYC site to see if I can flush out the info.............. JJ .