Do you refrigerate readi-cat before taking it in liquid form?

I realize this answer is very late but may help someone in future.

No, Readi-cat does not need to be refrigerated.

Readi-Cat (Barium sulfate) is in a group of drugs called contrast agents. Barium sulfate works by coating the inside of your esophagus, stomach, or intestines which allows them to be seen more clearly on a CT scan or other radiologic (x-ray) examination.

Barium sulfate is used to help diagnose certain disorders of the esophagus, stomach, or intestines.

How should I use barium sulfate?

Use this medication exactly as prescribed by your doctor. Do not use it in larger amounts or for longer than recommended.

Barium sulfate comes in tablets, paste, cream, or liquid forms.

In some cases, barium sulfate is taken by mouth. The liquid form may also be used as a rectal enema.

You may need to begin using this medication at home a day before your medical test. Follow your doctor's instructions about how much of the medication to use and how often.

If you are receiving barium sulfate as a rectal enema, a health care professional will give you the medication at the clinic or hospital where your testing will take place.
Do not crush, chew, or break a barium sulfate tablet. Swallow the pill whole.

Dissolve the barium sulfate powder in a small amount of water. Stir this mixture and drink all of it right away. To make sure you get the entire dose, add a little more water to the same glass, swirl gently and drink right away.
If you receive the medication as a liquid to take by mouth, shake the liquid well just before you measure a dose. To be sure you get the correct dose, measure the liquid with a marked measuring spoon or medicine cup, not with a regular table spoon. If you do not have a dose-measuring device, ask your pharmacist for one.

Carefully follow your doctor's instructions about what to eat or drink within the 24-hour period before your test.
Store this medication at room temperature away from heat and moisture. Keep the bottle tightly closed when not in use.

https://www.drugs.com/mtm/barium-sulfate-oral-rectal.html