What you are looking for is (USP) United States Pharmacopia, and an expiration date at least a year or more out. I would only get meds from a US based business, also only if they show me a picture of the drug (so I can look up the identifiers in drug reference or on a pill identifier on line) . There are relabelers e.g.: a large chain drug store orders x number of an antibiotic and there is an over run, this goes to a relabeler. You also have to remember there people that have fish that cost more than our cars. A vet will not give them substandard meds. I would only use antibiotics from Aquatic Pharmacy, a US company in Avery Island, Wa. Aquaticpharmacy.com. all of my requirements are met with them.
"This is for information purpose only" ! More damage than good can be done with any medication if you have not been educated. I would also recommend getting an good book like (The Sandford Guide To Antimicrobial Therapy) , most of us were born with a good immune. System, that said sometimes we need help. You also have to remember that antibiotics kill the good as well as the bad bugs. That's why people get the $H!T$ . Also as with any medication there always side effects, and the possibly of an allergic reaction that could KILL. Do you have the knowledge or meds to combat this, can you secure an airway manually or surgically. All of these things have to be taken into account before you administer even an aspirin (ASA) .
Let me get off track here for just a minute! Every should have 81 mg baby ASA on hand for someone presenting with S/S of a MI (heart attack) . AND WOMEN PRESENT DIFFRENTLY THAN men. This could save a LIFE.
So here is some info to hopefully help you start an informed decision.
Good luck, be safe, and God bless.
P.S. what I am comfortable giving and\or doing is because of years of school, training and experience. Even then sometimes I sit back and ponder for a minute or look up S/S, drugs, or confer with a colleague.
Start now and learn, there some good books and websites th get more info.
PM I will give you more info for your educating your self.
God's speed.