Are aquarium salt and Epsom salt the same?

No. Aquarium salt is sodium chloride; Epsom salt is magnesium sulfate. They are different compounds with different uses and are not interchangeable.

Which salt do I use for a bloated fish?

Epsom salt. As a magnesium-sulfate laxative and muscle relaxant, it is the one used for bloating, constipation, and internal swelling, not aquarium salt.

Can I use Epsom salt for dropsy in fish?

It is commonly used to help draw down the internal swelling of dropsy, but only as supportive care. Dropsy is usually a sign of a serious underlying problem; Epsom salt eases a symptom, it does not cure the cause.

Can I substitute aquarium salt for Epsom salt?

No. Aquarium salt will not relieve constipation or internal swelling, and Epsom salt is not a general tonic. Using the wrong one wastes time on a sick fish.

Tools · Treatment

Antibiotic Treatment Course Tracker

Medically reviewed by Dr. Olivier Toulza August 27, 2026

Finishing an antibiotic course correctly matters, stopping early is a common reason infections come back, sometimes resistant. This tracker helps you log each dose, see at a glance how many days are left, and, just as important, recognize when a course that’s not working means it’s time to call your veterinarian.

How it works: set up your treatment below. The medication, the day you started, how long the course is, and how often you dose. Then log each dose as you give it. The tracker shows your progress, reminds fish keepers to do a water change before re-dosing, and flags when a course isn’t working. Everything saves on this device only. This is an organizing aid, not a treatment plan: the medication, dose, and duration must come from your veterinarian.

Set up the treatment

Animal Medication (as your vet prescribed) Start date Course length (days) Doses per day

This tracker organizes a treatment your veterinarian has prescribed. It doesn’t set doses or decide treatment. Always follow the medication label and your vet’s direction. If your animal is getting worse, stop guessing and contact a veterinarian.

Why finishing the course matters

Antibiotics work by keeping the drug at an effective level for long enough to clear the infection. Stopping as soon as your pet looks better can leave the hardiest bacteria alive. And those are the ones that come back, often harder to treat. Unless your veterinarian tells you to stop, complete the full course, even if your animal seems recovered partway through.^[1]

For fish: change water before you re-dose

Treating a fish in a hospital tank is different from giving a dog a pill. Many aquarium antibiotics call for a partial water change before the next dose, to remove waste and old medication and keep water quality safe during treatment.^[2] This tracker reminds you at each fish dose. But always follow your specific product’s label for the exact schedule and amount. (Fish-specific guidance reviewed by Dr. Julia Bauer.)

When “not working” means contact a licensed veterinarian

Antibiotics don’t fix every problem. If your animal isn’t improving after a few days, is getting worse, or was never a clear antibiotic case to begin with, continuing to dose isn’t the answer. A veterinarian needs to reassess. Responsible treatment means knowing when to stop and seek help, not just finishing the bottle.

Frequently asked questions about tracking a treatment

Does this decide the dose for my pet?

No. Your veterinarian sets the medication, dose, and length of the course. This tool only helps you organize and log the treatment they prescribed.

Should I stop when my pet looks better?

Not unless your vet says so. Stopping early is a common reason infections return, sometimes resistant. Finish the course as prescribed.

Why the water-change reminder for fish?

Many aquarium antibiotics call for a partial water change before re-dosing, to keep water quality safe and remove old medication. Follow your product label for the exact schedule.

What if it’s not working?

If your animal isn’t improving after a few days or is getting worse, contact your veterinarian. Continuing to dose an ineffective treatment isn’t the answer.

Where is my log stored?

On this device and browser only, nothing is sent to us. Use Print / Save to keep a paper copy.

How this tool is reviewed

The general treatment guidance on this tool, completing a course, and recognizing when to escalate to a veterinarian, has been reviewed and approved by Dr. Olivier Toulza, whose specialty is internal medicine. The fish-specific water-change guidance has been reviewed and approved by Dr. Julia Bauer. See our Veterinary Review Board for their credentials.

Sources & References

Clinical statements on this page are drawn from veterinary references and guidelines. Full review by our veterinarian of record is pending.

[1] Completing a full antibiotic course as prescribed, and not stopping early, is standard veterinary and medical guidance to reduce relapse and resistance (general clinical references).
[2] Many aquarium antibiotic products direct a partial water change before re-dosing; follow the specific product label. Escalating to a veterinarian when an animal fails to improve is standard practice.

For educational use. PrepperPetSupply is a licensed, veterinarian-staffed pharmacy; prescriptions are dispensed only after review by a licensed veterinarian and are not a substitute for in-person veterinary care. Not for human use.