Promethazine
Promethazine is a sedating antihistamine for allergies, travel sickness and nausea, sold as Phenergan 10mg and 25mg tablets and as a 100ml syrup.
Phenergan Syrup
Promethazine
100ml
Phenergan Syrup is generic promethazine in a 100ml bottle, a sedating antihistamine used for allergies, hives, nausea and travel sickness, and for short-term sleep problems.
Promethazine has been around for decades, and it is still reached for when an allergy, a rough journey or a bout of sickness needs something that also makes you drowsy. Two products are sold here: Phenergan tablets in 10mg and 25mg, and Phenergan Syrup in a 100ml bottle.
Where promethazine gets used
Picture three situations. A person with hay fever wakes with swollen eyes and a nose that will not stop running. A passenger facing a long coach journey knows the winding road ahead will bring on queasiness. Someone with an outbreak of itchy hives cannot settle at night. Promethazine suits all three, because histamine drives each of them and the tablet blocks it. It also quietens nausea and vomiting, and hospitals give it to calm patients before an operation. The relief lasts as long as the dose does.
Tablets, syrup and timing
If swallowing tablets is a struggle, the 100ml syrup is the easier route; otherwise the 10mg and 25mg tablets give a set dose with a drink of water. Use the spoon or cup from the box to measure syrup, because a kitchen spoon can be off by a good margin.
Before a long drive, flight or ferry, most people take a dose 30 to 60 minutes ahead and a second after 8 to 12 hours if the trip drags on. In allergy season the doses are spread across the day, with the last at bedtime, and for nausea or a cold they come every 4 to 6 hours as needed.
Sleepiness and other effects
Expect to feel drowsy, with a dry mouth, blurred vision or dizziness, mostly over the first few doses. Children in particular can turn restless where an adult would turn sleepy. Twitching or muscle spasms in the face, neck or tongue are rare. High fever with stiff muscles, sweating and confusion is rarer still and needs urgent treatment.
Alcohol and other sedating medicines
Alcohol, sleeping tablets, anxiety medicines and opioid painkillers all deepen the drowsiness, so one drink can leave you far less steady than usual. Keep the tablets in their original pack in a cool spot, and close the syrup bottle tightly after each measure.
Sources
- Promethazine: MedlinePlus Drug Information — MedlinePlus
- Phenergan 25 mg tablets - Summary of Product Characteristics (SmPC) - (emc) — electronic medicines compendium (emc)
Where can I buy Promethazine in Hong Kong?
Promethazine can be ordered online with delivery to Hong Kong. The range is generic Phenergan tablets in 10mg and 25mg, plus generic Phenergan Syrup in 100ml bottles. Payment is by Visa, Mastercard or American Express on a secure, encrypted payment page, or by Bitcoin or Ethereum.
How much does Promethazine cost?
Prices vary between the two promethazine products and between pack sizes. Every product page lists its current prices in HKD or in the currency you choose.
Do I need a prescription to order Promethazine?
PockDose does not ask you to upload a prescription when you order promethazine. See the ordering FAQ for details.
What are the other names for promethazine?
Phenergan is a brand name of promethazine, which is also sold as Sominex. Here, promethazine can be bought online as generic Phenergan. These are generics, not the original brand.
How long before travel should I take promethazine?
Take it 30 to 60 minutes before you set off, which gives the dose time to settle before the motion starts. If the journey runs on, a second dose can be taken after 8 to 12 hours. On a trip lasting several days, one dose in the morning and one before the evening meal each day keeps the effect going.
Can I drink alcohol with promethazine?
Alcohol adds to promethazine's drowsiness, and the two together can leave you dizzy, unsteady and slow to react. One drink may be enough to feel the difference, because the medicine is already sedating. Plan drinks for a day when no dose is due.
What is the difference between the 10mg and 25mg promethazine tablets?
Both strengths are the same medicine in different amounts. A 25mg tablet is the usual single adult dose, while the 10mg tablet allows a smaller dose to be taken in one go.
Is promethazine a non-drowsy antihistamine?
No. It is an older, sedating antihistamine, and the drowsiness is part of why people choose it for a night-time allergy dose or a journey they would like to sleep through. Cetirizine and loratadine are the newer kind, far less likely to leave you sleepy.
Does promethazine help with itching?
Yes, itch from hives and allergic reactions is one of its main uses, because it blocks the histamine that causes it. It does little for dry or irritated skin with another cause. Taking a dose at bedtime means the worst of the itching is slept through.