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Promethazine Hcl Tablet — prescription drug image

Promethazine Hcl

Promethazine HCl 25MG

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What is Promethazine Hcl?

Phenergan is used to treat allergic reactions. Promethazine is the generic version of Phenergan. On average, Phenergan is priced at about $6,885 for a supply of 30, 5 mg tablets. You can significantly lower the price of Phenergan by using our free Singlecare coupon card at a local participating pharmacy.

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What is Promethazine Hcl ?

Phenergan is used to treat allergic reactions. Promethazine is the generic version of Phenergan. On average, Phenergan is priced at about $6,885 for a supply of 30, 5 mg tablets. You can significantly lower the price of Phenergan by using our free Singlecare coupon card at a local participating pharmacy.
  • Seizures
  • Lightheadedness or fainting
  • Trouble breathing, slow breathing
  • Yellow skin or eyes
  • Twitching or muscle movements you cannot control
  • Seeing or hearing things that are not there (especially in children)
  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
  • Fever, sweating, confusion, uneven heartbeat, muscle stiffness
  • This medicine may cause the following problems:Breathing problems, which could be life-threateningNeuroleptic malignant syndrome (a nerve disorder that can be life-threatening)Liver problems
  • Use in children: Give the medicine exactly as directed by the child's doctor. Too much of this medicine can cause death in a young child. Do not give this medicine to a child younger than 2 years old, unless your doctor tells you to.
  • Tell any doctor or dentist who treats you that you are using this medicine. This medicine may affect certain medical test results.
  • Tell your doctor if you are pregnant or breastfeeding, or if you have liver disease, heart or blood vessel disease, glaucoma, a stomach ulcer, bowel problems, an enlarged prostate, bone marrow problems, trouble urinating, or seizures. Also tell your doctor if you have breathing problems, such as COPD, asthma, or sleep apnea.
  • This medicine may make you dizzy or drowsy. Do not drive or do anything that could be dangerous until you know how this medicine affects you.
  • This medicine may make your skin more sensitive to sunlight. Wear sunscreen. Do not use sunlamps or tanning beds.
  • Keep all medicine out of the reach of children. Never share your medicine with anyone.
  • Yellow skin or eyes
What is promethazine HCl used for?
On the oral and rectal labels, promethazine is FDA-approved for allergy conditions such as seasonal and year-round allergic rhinitis, vasomotor rhinitis, allergic conjunctivitis, hives and angioedema, dermographism, allergic reactions to blood or plasma or to drugs, and as an add-on to epinephrine in anaphylaxis. It is also approved to prevent and control nausea and vomiting associated with certain types of anesthesia and surgery, to prevent and treat motion sickness, for sedation before and after surgery and during obstetric care, as an adjunct to pain relievers after surgery, and for sedation and relief of apprehension. Your prescriber will tell you which use applies to you.
Is promethazine a controlled substance?
Promethazine hydrochloride by itself is not a controlled substance. Note that combination products are different: promethazine with codeine contains an opioid and is controlled. If you are filling a combination product, check the specific product name on your prescription.
How long does it take for promethazine to work and how long does it last?
Onset and duration depend on the form and dose, and the FDA label is the place to look for the specifics that apply to your prescription. Rather than relying on a general figure, ask your pharmacist how quickly your particular form and strength is expected to act and how long the effect should last, and follow the dosing schedule your prescriber gave you. Drowsiness in particular can last longer than you expect, so do not drive until you know how the medicine affects you.
Can you take promethazine for nausea or as a sleep aid?
Promethazine is FDA-approved for preventing and controlling nausea and vomiting associated with certain types of anesthesia and surgery, and for motion sickness. It is also approved for sedation and relief of apprehension and for producing light sleep in specific clinical settings. It is sometimes prescribed for nausea from other causes or as a sleep aid, but those uses are off-label. Only take promethazine for a reason your own prescriber has directed, and do not use someone else's prescription.
What should you not take with promethazine?
Avoid combining promethazine with alcohol, opioids, sedatives, sleep medicines and other drugs that depress the central nervous system, because the sedating effects add together and can slow breathing. It should not be used in people in a comatose state, in anyone allergic to promethazine or other phenothiazines, or to treat lower respiratory symptoms including asthma. It is also not for children under 2 years old. Because of its anticholinergic effects, tell your prescriber if you have narrow-angle glaucoma, an enlarged prostate, bladder-neck obstruction or a stenosing peptic ulcer. Give your pharmacist a full list of everything you take, including over-the-counter products.
How much does Promethazine Hcl cost without insurance?
The price of Promethazine Hcl without insurance varies by pharmacy, dosage, and quantity. Rx.com compares cash prices at more than 60,000 US pharmacies so you can find the lowest price near you. Many people save up to 48% off retail prices with a free Rx.com coupon.
What are the common side effects of Promethazine Hcl?
Common side effects of Promethazine Hcl may include: Seizures, Lightheadedness or fainting, Trouble breathing, slow breathing, Yellow skin or eyes, Twitching or muscle movements you cannot control. This is not a complete list — consult your pharmacist or doctor for full side effect information.
Is there a generic version of Promethazine Hcl?
Generic versions may be available for Promethazine Hcl. Generics contain the same active ingredients as brand-name drugs and are typically 80–90% cheaper. Search Promethazine Hcl on Rx.com to compare generic and brand prices at pharmacies near you.
What is the cheapest pharmacy for Promethazine Hcl?
The cheapest pharmacy for Promethazine Hcl depends on your location and dosage. Rx.com compares prices at CVS, Walgreens, Walmart, Kroger, Costco, and thousands of independent pharmacies. Enter your ZIP code on Rx.com to find the lowest price for Promethazine Hcl near you.

Promethazine Hcl Coupons & Prices

Promethazine HCl 25MG

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Promethazine Hcl Tablet — prescription drug image
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A promethazine HCl coupon from Rx.com lets you compare the cash price of generic promethazine hydrochloride across more than 60,000 U.S. pharmacies before you fill it. Promethazine is a first-generation antihistamine used for allergy symptoms, for nausea and vomiting related to certain surgery and anesthesia, for motion sickness, and for sedation. The generic is widely available and substitutable, but what a pharmacy charges you in cash can differ a lot from one store to the next, even within the same town. Enter your ZIP above to see today's price near you and bring the coupon to the counter.

What is promethazine HCl and how does it work?

Promethazine hydrochloride is a phenothiazine derivative that acts as an H1 antihistamine. Along with blocking histamine, it has antiemetic (anti-nausea), sedative and anticholinergic activity, and it also blocks dopamine D2 receptors. Unlike other phenothiazines, promethazine is not used as an antipsychotic. The brand Phenergan tablets were discontinued in the U.S., so what pharmacies dispense today is the generic. Related products under other names include Phenadoz and Promethegan suppositories, and combination products such as promethazine VC and promethazine with codeine.

On the oral and rectal labels, FDA-approved uses include perennial and seasonal allergic rhinitis, vasomotor rhinitis, allergic conjunctivitis, allergic reactions to blood or plasma, uncomplicated allergic skin reactions such as hives and angioedema, dermographism, adjunctive therapy with epinephrine in anaphylaxis, and easing allergic reactions to drugs. It is also approved for prevention and control of nausea and vomiting associated with certain types of anesthesia and surgery, for motion sickness, for preoperative, postoperative and obstetric sedation, as an adjunct to pain relievers after surgery, and for sedation and relief of apprehension. Your prescriber decides which of these applies to you.

What promethazine costs without insurance, and why comparing matters

Promethazine HCl is a generic with no manufacturer savings card, so a discount coupon is the main way most cash-paying patients lower the price. There is no single national price. Pharmacies set their own cash prices, and the spread between a grocery-store pharmacy, a big chain and an independent down the street can be wide for the exact same tablets and quantity. That is why it pays to check before you fill rather than after.

Rx.com compares cash prices at more than 60,000 pharmacies and shows the discounted price you would pay at each one. The coupon is free and does not require insurance. If you do have insurance, it is worth comparing your copay against the cash coupon price, because for inexpensive generics the coupon is sometimes the better of the two. Enter your ZIP above to see today's price near you.

Promethazine alternatives and how it compares

Promethazine is one of several options a prescriber may consider, and the right one depends on what is being treated. For nausea and vomiting, other commonly prescribed medicines include ondansetron (brand Zofran), prochlorperazine and metoclopramide. For motion sickness, meclizine is a frequent alternative and is far less sedating for many people. For allergy symptoms, other antihistamines such as hydroxyzine HCl and diphenhydramine are used.

Within the promethazine family, promethazine DM and promethazine with codeine are separate combination products with their own labels and their own prices. Because these medicines differ in how sedating they are and in their side effects, the choice is one to make with your prescriber, not on price alone. Once you know which one you are filling, compare the cash price for that exact product and quantity.

Safety information worth knowing

The oral and rectal forms of promethazine carry a boxed warning: it is contraindicated in children under 2 years of age because of the potential for fatal respiratory depression. In children 2 and older, the lowest effective dose should be used, with caution if other medicines that depress breathing are also being taken. The injection carries a separate boxed warning about severe tissue injury, including gangrene. Promethazine should not be used in comatose states, in anyone with hypersensitivity to promethazine or other phenothiazines, or to treat lower respiratory tract symptoms including asthma.

Promethazine causes marked drowsiness that can impair driving or operating machinery, and its effects add to those of alcohol, opioids, sedatives and other CNS depressants. Other label warnings include a lowered seizure threshold, neuroleptic malignant syndrome, bone marrow depression including leukopenia and agranulocytosis, extrapyramidal and dystonic reactions, cholestatic jaundice and photosensitivity. Anticholinergic effects such as dry mouth, blurred vision and urinary retention mean it should be avoided in narrow-angle glaucoma, prostatic hypertrophy, bladder-neck obstruction and stenosing peptic ulcer. It may interfere with pregnancy tests and raise blood glucose. Older adults are more prone to confusion, heavy drowsiness and falls, and promethazine appears on the AGS Beers Criteria as potentially inappropriate for them. Some formulations contain sulfites, which can trigger asthma or anaphylaxis in susceptible people. This is a summary, not medical advice; read the label that comes with your prescription and talk with your prescriber or pharmacist about your own situation.

Sources & accuracy

This Promethazine Hcl information was written and reviewed against authoritative U.S. medical sources — MedlinePlus (U.S. National Library of Medicine), DailyMed, and FDA prescribing information — and checked for accuracy. It is provided for education and is not a substitute for professional medical advice.

Verify the official label: Promethazine Hcl on DailyMed (FDA)

Reviewed against FDA labeling · Last reviewed July 2026

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Medical disclaimer: This information is provided for general educational purposes only and is not medical advice. It is not a substitute for professional diagnosis or treatment. Always consult a licensed physician, pharmacist, or other qualified healthcare provider before starting, stopping, or changing any medication or treatment. Never disregard professional medical advice or delay seeking it because of something you read here. If you think you may have a medical emergency, call your doctor or 911 immediately.


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