I have never used ammo lock but the likely active ingredient is sodium hydroxymethanesulfonate and hopefully will be listed on the bottle.
Ammonia test kits that use nessler reagents will give incorrect readings when using this chemical. It is not likely you have one of these kits. I don't think they make them any more.
I would not recommend the use of any ammonia detoxifier in conjunction with medications so unless the the treatment method is hypo you may have a problem.
Seachems ammonia sensor can be used to indicate free ammonia levels only. I have never run across a chemical test kit that reads any thing but total ammonia although they may be out there.
For future reference and if you have a sump; keeping a decent size sponge filter going in it will give you a instant/movable, mature bio filter when spur of the moment hospital tanks have to be set up. Just dont make the mistake of ringing it out in tap water to clean it. AFter a water change ring it out in the change water bucket to clean it.
Good luck.