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PROMETHAZINE PLAIN vs THIORIDAZINE HYDROCHLORIDE

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 17, 2026·How we rate

Possible drug interaction. PROMETHAZINE PLAIN and THIORIDAZINE HYDROCHLORIDE are different prescription medicines. Combining or switching between them can cause interactions — talk to a pharmacist or prescriber before making changes. This page is not medical advice.

Rating

New
70/100

Pharmacy pays

~$1.53 /30
~$22.23 /30

Type

RX
RX

Active ingredient

PROMETHAZINE HYDROCHLORIDE
THIORIDAZINE HYDROCHLORIDE

Dosage forms

Syrup
Tablet

Drug class

Phenothiazine
Phenothiazine

Boxed warning

Half-life

about 9 to 16 hours

Treats

Anaphylaxis, Allergic Conjunctivitis, Motion Sickness
Psychotic Disorders, Schizophrenia

Frequently asked questions

Which is cheaper, Promethazine Plain or Thioridazine Hydrochloride?

Promethazine Plain costs pharmacies less to acquire — about $1.53 vs $22.23 for a 30-count supply, per the CMS NADAC survey. That gap is in the pharmacy's cost of goods, not necessarily in what you pay: your price is set afterwards by your insurer and the pharmacy.

What is the difference between Promethazine Plain and Thioridazine Hydrochloride?

Promethazine Plain contains Promethazine Hydrochloride, while Thioridazine Hydrochloride contains Thioridazine Hydrochloride — they have different active ingredients.

Ratings are based on FDA regulatory (recall-safety) data. This comparison is for general reference only — not medical advice. Always consult a licensed professional before choosing or switching a medication.