Phenergan (Promethazine) 25 mg Tablets

Phenergan is a brand of promethazine, a first-generation antihistamine that doctors have prescribed for decades to calm allergic reactions, prevent or relieve motion sickness, and ease nausea and vomiting. We carry it as a 25 mg oral tablet, and this guide explains how it works, how it is typically taken, what to watch for, and how our ordering process works.

What Phenergan Is and How We Offer It

The active ingredient in Phenergan is promethazine, a phenothiazine-class antihistamine. Beyond blocking histamine, promethazine has sedating, anti-nausea, and anticholinergic effects. These actions support its use for allergic conditions such as hives, itching, and allergic rhinitis; prevention and relief of motion sickness; and control of nausea and vomiting from various causes. We offer Phenergan exclusively as a 25 mg oral tablet, and the summary below brings together the core facts about the product we sell.

How Phenergan Works and How It Is Typically Used

Promethazine works mainly by blocking H1 histamine receptors, reducing the itching, swelling, and runny-nose symptoms that histamine can trigger during an allergic response. Its effects on other receptor systems in the brain produce sedation and help suppress nausea and vomiting signals associated with the vomiting center and vestibular system. Effects after an oral dose commonly begin within about 20 minutes. They generally last four to six hours, although some effects may continue for as long as 12 hours.

The appropriate dose depends on the condition, age, response, other medicines, and degree of sedation. General adult regimens in promethazine labeling include 25 mg at bedtime for allergy symptoms, with some regimens using 12.5 mg before meals and at bedtime. For nausea and vomiting, the usual adult dose is 25 mg initially, followed by 12.5 mg to 25 mg every four to six hours when needed and specifically directed. For motion sickness, an adult regimen may use 25 mg taken 30 to 60 minutes before departure and, when needed, another dose eight to 12 hours later; continued travel may call for a dose on arising and again with the evening meal. These are general examples, not personal dosing instructions. A prescriber should set the exact starting dose, frequency, duration, and maximum daily amount.

Phenergan may be taken with or without food. A light snack may reduce stomach upset for someone who finds it irritating on an empty stomach. Sedation is often most noticeable with the first few doses and may lessen as the body adjusts, but significant drowsiness can persist. Do not take extra tablets to make up for a missed dose, and do not double a dose because symptoms remain. Lower promethazine doses may require another strength or dosage form. The offered 25 mg tablet should not be split unless a pharmacist or prescriber confirms that the supplied tablet is suitable for splitting and provides appropriate directions.

Promethazine is strictly contraindicated in children younger than 2 years because of the risk of potentially fatal respiratory depression. In children 2 years and older, it should be used only at the lowest effective dose and with particular caution around any other medicine that can slow breathing. This firm contraindication for children under 2 is distinct from the broader precautions that apply to older children and adults.

How Promethazine Differs From Other Options

Promethazine is more sedating and has stronger anticholinergic effects than many newer antihistamines, such as cetirizine, loratadine, or fexofenadine. A less-sedating antihistamine may therefore be preferable when treating routine daytime allergy symptoms, particularly when driving or sustained concentration is important. For motion sickness, alternatives such as meclizine or dimenhydrinate also commonly cause drowsiness, but their dose timing and duration differ. For nausea and vomiting, the best alternative depends on the cause, because medicines such as ondansetron, prochlorperazine, and metoclopramide have different mechanisms, adverse-effect profiles, and appropriate uses. A prescriber can help select an option based on the symptom pattern and medical history.

Available Strength and Package Options

We keep the Phenergan lineup simple: a single 25 mg oral tablet strength, offered in packages of 90, 120, 180, 270, or 360 pills. Each pill is one 25 mg tablet. This range lets someone managing occasional seasonal allergy flare-ups choose a smaller package, while someone following a longer prescribed regimen can choose a larger supply and reduce how often they need to reorder.

Because we offer only the 25 mg strength, a prescribed regimen that calls for a lower dose may require a different strength, a different dosage form, or specific tablet-splitting instructions. Anyone who finds the tablet too strong, too sedating, or insufficiently effective should ask the prescriber to review the regimen rather than independently splitting tablets, changing the frequency, or taking additional doses.

Safety, Interactions, and Storage

Promethazine's US labeling contraindicates its use in anyone with a demonstrated hypersensitivity or idiosyncratic reaction to promethazine or another phenothiazine medicine, such as chlorpromazine or prochlorperazine. It is also contraindicated in comatose states and should not be used to treat lower respiratory tract symptoms, including asthma. A specific history of a phenothiazine reaction is therefore important, while an unrelated allergy does not automatically exclude use.

Because Phenergan can cause marked drowsiness and impair the mental and physical abilities needed for driving or operating machinery, avoid those activities until its effects are known. Alcohol can substantially worsen impairment. Combining Phenergan with other central nervous system depressants, including opioids, benzodiazepines, sedatives, certain sleep medicines, anesthetics, and some other antihistamines, can intensify sedation and respiratory depression. A prescriber may need to reduce doses or avoid a combination. Medicines with anticholinergic effects can also add to dry mouth, blurred vision, constipation, urinary retention, and overheating.

Extra caution is appropriate for people with breathing disorders, sleep apnea, seizure disorders, glaucoma, bladder-neck obstruction, an enlarged prostate, or digestive tract obstruction. Promethazine can interfere with certain laboratory tests and has been reported to increase blood glucose, so people with diabetes may need closer glucose monitoring. Tell the clinician and testing laboratory about promethazine use before relevant testing.

Common adverse effects include drowsiness, dizziness, dry mouth, blurred vision, constipation, and impaired coordination. Seek prompt medical help for difficulty breathing, severe confusion, fainting, a seizure, severe muscle stiffness with fever, uncontrolled or unusual movements, pronounced restlessness, yellowing of the skin or eyes, or signs of a serious allergic reaction. Older adults may be more susceptible to confusion, dizziness, low blood pressure, constipation, and urinary problems.

Use during pregnancy requires individual medical judgment because promethazine crosses the placenta and available human pregnancy data are limited. It should be used only when the expected benefit justifies the potential risk. It is not known whether promethazine passes into human milk, so a nursing parent and clinician should weigh the importance of treatment against the uncertainty and the possibility of sedation or other effects in the infant.

Store Phenergan tablets at 68°F to 77°F, with brief excursions permitted between 59°F and 86°F. Keep them in a tightly closed, light-resistant container protected from light and excess moisture. Store the package securely out of children's reach and sight, especially because an accidental dose can be dangerous for a young child. Do not use tablets that are damaged, discolored, or beyond their labeled expiration date; ask a pharmacist about safe disposal.

Ordering Phenergan From Us

In the United States, promethazine is used in authorized human medicines, and oral promethazine tablets are classified as prescription medicine. A licensed prescriber should determine whether treatment is appropriate and provide individualized directions. Our current ordering information does not specify the prescription documentation required at checkout for this product, so customers should contact our support team to confirm the current ordering steps before placing an order.

Our team, including pharmacists, is available 24/7 through email, online chat, and phone to answer questions about package sizes, ordering steps, or general product information. Once an order is confirmed, we pack and dispatch it as part of the service we have provided since 2008, aiming for straightforward, reliable delivery.

If Phenergan is being considered mainly for seasonal or environmental allergy symptoms, our AntiAllergics selection provides related options. The right medicine for an individual situation is still best confirmed with a prescriber who knows that person's health history, symptoms, and current medicines.