An effective placebo to a well-known red pill containing antianxiety medication would be what color?

The answer to this question would be: red

Placebo is made of a substance that has no active therapeutic effect. Giving placebo is an important thing to do in research as it allows blinding and removes the placebo effect.

When giving a placebo drug, the placebo should be as similar as it could with the drugs. Giving a placebo with different color could tell the patient and the doctor that the drug is false.