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Tris Promethazine Hydrochloride and Codeine Phosphate Oral Solution: Uses, Effects and Safety
Buy Tris Promethazine Codeine Syrup. Tris Promethazine Hydrochloride and Codeine Phosphate Oral Solution is a prescription combination medicine containing promethazine hydrochloride and codeine phosphate. The two active ingredients have different properties and work through different mechanisms. Codeine is an opioid that can suppress the cough reflex by acting on the central nervous system. Promethazine is an antihistamine that can help with certain allergy-related symptoms and can also cause sedation.
A combination containing these ingredients may be considered for selected cough symptoms when a healthcare professional determines that it is appropriate. However, it is important to remember that a cough is a symptom rather than a diagnosis. Coughing can be caused by infections, allergies, asthma, postnasal drainage, acid reflux, environmental irritants, and many other conditions. Because codeine is an opioid, this medication requires considerably more caution than an ordinary non-prescription cough remedy. It can cause drowsiness, impaired coordination, constipation, nausea, physical dependence, and potentially dangerous respiratory depression, particularly when it is taken incorrectly or combined with other substances that slow the central nervous system.

What Is Tris Promethazine and Codeine Syrup?
Tris oral solution contains two principal active ingredients:
Codeine phosphate is an opioid medicine with cough-suppressing properties. It acts on the central nervous system and can reduce the body’s response to coughing.
Promethazine hydrochloride is an antihistamine. It blocks certain effects of histamine and can help with some allergy-related symptoms. It also has sedating properties, meaning that it can make a person feel sleepy or less alert.
The combination is therefore different from a simple single-ingredient cough suppressant.
Treatment should always be based on the individual’s symptoms, medical history, age, other medicines, and the underlying reason for the cough.
How Does Tris Work?
The cough-suppressing component of the formulation is codeine.
Coughing is a protective reflex designed to help clear the airways of mucus, irritants, or foreign material. Codeine can reduce the activity of the neural pathways involved in the cough response, which may decrease the urge or frequency of coughing.
This may provide temporary symptom relief for some patients.
However, reducing a cough does not necessarily mean that the underlying problem has been treated.
For example, someone coughing because of asthma may require asthma-specific treatment, while someone experiencing reflux-related coughing may need treatment aimed at acid reflux. Similarly, a respiratory infection may follow a different course and require a different approach.
What Does Promethazine Contribute?
Promethazine works differently from codeine.
As an antihistamine, it can reduce the effects of histamine and may help with certain allergic symptoms. Promethazine can also have a substantial sedating effect.
This means a person may experience:
- Sleepiness
- Reduced alertness
- Dizziness
- Slower reactions
- Impaired coordination
When promethazine is combined with codeine, these sedating effects can become particularly important from a safety perspective.
The medicine should therefore not be combined casually with alcohol, sleeping medicines, opioids, benzodiazepines, or other substances that cause central nervous system depression.
What Type of Cough May Require Medical Evaluation?
Not every cough should be treated with an opioid-containing medicine.
Coughing can occur because of:
- Viral respiratory infections
- Bacterial infections
- Seasonal allergies
- Asthma
- Postnasal drip
- Acid reflux
- Smoking or vaping exposure
- Air pollution
- Dust or chemical irritation
- Chronic lung conditions
- Other underlying illnesses
A cough that is unusually severe, persistent, recurrent, or progressively worsening should be evaluated rather than repeatedly suppressed.
Medical assessment is especially important when coughing is accompanied by shortness of breath, chest pain, coughing up blood, significant fever, confusion, or other concerning symptoms.
Understanding the 473 mL Bottle
The 473 mL measurement describes the amount of liquid contained in the bottle. It is not a recommended dose.
The amount a patient should take at one time depends on the specific prescription, formulation, concentration, age, medical history, and other individual factors.
Patients should never determine a dose based simply on the size of the bottle or by comparing their medication with somebody else’s prescription.
How Should the Oral Solution Be Measured?
Liquid prescription medicines should be measured carefully.
A pharmacist can recommend an appropriate oral syringe, measuring cup, or other dosing device designed for medicines.
A normal kitchen spoon should not be relied upon for precise medication measurement because household spoons vary in size.
Patients should follow the instructions on their prescription label and should contact their pharmacist if they are uncertain about:
- The amount to take
- How frequently to take it
- How to measure the liquid
- How long to use it
- Whether it can be taken with another medicine
Never increase the amount because the cough has not improved as quickly as expected.
Important Safety Information
The presence of codeine means that this medicine carries opioid-related risks.
Taking more than prescribed can increase the likelihood of serious adverse effects rather than simply providing additional relief.
Potential complications include:
- Excessive sedation
- Severe dizziness
- Confusion
- Impaired coordination
- Respiratory depression
- Loss of consciousness
- Overdose
The risk can become substantially higher when the medicine is combined with other central nervous system depressants.
Avoid Alcohol
Alcohol can intensify the sedating effects of both codeine and promethazine.
Combining them may result in:
- Extreme drowsiness
- Poor coordination
- Impaired judgment
- Confusion
- Loss of consciousness
- Dangerous breathing suppression
Alcohol should generally be avoided while taking this medication unless a healthcare professional has specifically advised otherwise.
Be Careful With Other Sedating Medicines
Tell your doctor or pharmacist about every medication and supplement you take.
Particular caution may be necessary with:
- Opioid pain medicines
- Benzodiazepines
- Sleeping medicines
- Sedating antihistamines
- Muscle relaxants
- Certain psychiatric medicines
- Other central nervous system depressants
Combining several sedating substances can increase the risk of severe drowsiness and respiratory depression.
Can Tris Affect Driving?
Yes.
Both codeine and promethazine can reduce alertness.
A person may experience:
- Drowsiness
- Dizziness
- Slower reaction times
- Reduced concentration
- Poor coordination
- Impaired judgment
Do not drive or operate machinery until you know how the medication affects you and have received appropriate medical advice.
Even if a person feels capable of driving, their reaction time and coordination may still be impaired.

Common Side Effects
Potential side effects can include:
- Drowsiness
- Dizziness
- Nausea
- Vomiting
- Constipation
- Dry mouth
- Blurred vision
- Fatigue
- Reduced coordination
- Confusion
The severity of side effects can vary between individuals.
Older adults and people taking other sedating medicines may be more susceptible to some of these effects.
If side effects become severe, persistent, or interfere with normal activities, contact a healthcare professional.
Serious Side Effects and Emergency Symptoms
Some reactions require immediate medical attention.
Seek emergency help if someone taking the medication develops:
- Slow or difficult breathing
- Extreme sleepiness
- Difficulty waking
- Loss of consciousness
- Severe confusion
- Blue or gray lips or skin
- Severe weakness
- Swelling of the face, lips, tongue, or throat
- A serious allergic reaction
Respiratory depression is one of the most serious potential complications associated with opioid medicines.
If a person becomes unusually difficult to wake or appears to have stopped breathing normally after taking a codeine-containing medicine, emergency medical assistance should be obtained immediately.
Codeine, Metabolism, and Individual Differences
People do not all process codeine in the same way.
The body converts codeine into morphine through an enzyme called CYP2D6. Genetic differences can cause some people to convert codeine more rapidly than others.
This can affect both the medicine’s effectiveness and the amount of morphine produced in the body.
Some people may therefore experience stronger-than-expected opioid effects, while others may obtain relatively little benefit.
This is one reason why codeine should not be treated as a medication with identical effects in every person.
Dependence and Misuse
Codeine can lead to physical dependence.
With repeated exposure, the body can adapt to the presence of the opioid. Tolerance may also develop, meaning that the same amount can produce a reduced effect over time.
Physical dependence can occur even when a medicine is used as prescribed.
Misuse—such as taking more than prescribed, using someone else’s medicine, or combining it with other substances—can substantially increase the risk of harm.
Prescription opioid medicines should therefore be used only for the person for whom they were prescribed.
Children and Codeine
Codeine-containing medicines require particular caution in children.
Because individuals metabolize codeine differently, some children can produce morphine from codeine more rapidly than expected, potentially resulting in dangerous opioid exposure.
Age-related restrictions and warnings apply to codeine-containing products, and the suitability of a particular formulation depends on the product and the patient.
Parents and caregivers should never give a child someone else’s codeine medicine or use an adult prescription without specific medical direction.
Older Adults
Older adults may be more sensitive to the sedating effects of promethazine and codeine.
Potential problems include:
- Excessive drowsiness
- Confusion
- Dizziness
- Poor balance
- Falls
- Impaired coordination
A healthcare professional can consider these risks alongside other medications and medical conditions when determining whether the medicine is appropriate.
Pregnancy and Breastfeeding
Anyone pregnant, planning to become pregnant, or breastfeeding should discuss the use of promethazine-codeine products with a healthcare professional.
Codeine can cross the placenta, and opioid exposure during pregnancy can have effects on a developing fetus or newborn. Repeated opioid exposure may also result in neonatal opioid withdrawal.
Codeine can also pass into breast milk. Because some individuals metabolize codeine into morphine more rapidly than others, breastfeeding requires particular caution.
A healthcare professional can assess the potential benefits and risks and recommend the most appropriate option.
What If Too Much Is Taken?
Taking more of a codeine-containing oral solution than prescribed can result in an overdose.
Possible symptoms include:
- Extreme drowsiness
- Confusion
- Severe dizziness
- Slowed breathing
- Loss of consciousness
- Coma
The risk is particularly serious if the medication has also been combined with alcohol, opioids, benzodiazepines, or other sedatives.
If an overdose is suspected, seek emergency medical assistance immediately or contact an appropriate poison-control service. Do not wait for symptoms to become severe.
How Should the Medicine Be Stored?
Keep the medication securely stored according to the product’s instructions.
It should be:
- Kept in its original container
- Stored appropriately
- Kept away from children
- Kept away from people for whom it was not prescribed
- Never shared with another person
Unused opioid medication should be disposed of through an appropriate medication-disposal service or according to local pharmacy guidance.
Frequently Asked Questions
What is Tris promethazine-codeine syrup?
It is a prescription oral solution containing promethazine hydrochloride and codeine phosphate. Codeine provides cough-suppressing activity, while promethazine is an antihistamine with sedating properties.
Is Tris an ordinary cough syrup?
No. Because it contains codeine, it should be treated as a prescription opioid-containing medicine rather than an ordinary non-prescription cough remedy.
Does codeine stop coughing?
Codeine can suppress the cough reflex by acting on the central nervous system. However, it does not necessarily treat the underlying cause of the cough.
Does promethazine cause drowsiness?
Yes. Promethazine can cause significant sedation and may make a person sleepy or less alert.
Does the purple color identify the medicine?
Color should never be used as the sole method of identifying prescription medication. Always verify the label, packaging, concentration, and prescribing instructions.
Is 473 mL the dose?
No. It refers to the volume of liquid contained in the bottle. The prescribed dose is determined separately.
Can I take alcohol with promethazine-codeine?
Alcohol can intensify sedation and increase the risk of serious central nervous system depression and breathing problems. Speak with a healthcare professional about alcohol use.
Can this medicine be taken with Xanax or other benzodiazepines?
Combining codeine with benzodiazepines can increase the risk of severe sedation and respiratory depression. Such combinations should only be used under appropriate medical supervision.
Can codeine cause dependence?
Yes. Repeated use can lead to physical dependence and tolerance, while misuse can increase the risk of opioid use disorder.
Can I drive after taking the medicine?
The medicine can cause drowsiness, dizziness, impaired coordination, and slower reactions. Avoid driving until you know how it affects you and have received appropriate medical advice.
What should I do if I take too much?
An excessive amount can cause potentially life-threatening respiratory depression. Seek emergency medical assistance immediately if an overdose is suspected.
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Final Thoughts
Tris Promethazine Hydrochloride and Codeine Phosphate Oral Solution combines an antihistamine with an opioid cough suppressant. The formulation may provide temporary symptom relief in carefully selected circumstances, but it is not suitable for every cough or every patient. The presence of codeine is especially important because opioid medicines can cause sedation, impaired coordination, dependence, and potentially life-threatening respiratory depression. Promethazine can add to the sedating effects, making caution around alcohol and other central nervous system depressants particularly important.
The safest approach is to use the medicine only as directed by a qualified healthcare professional, measure the liquid accurately, never share the prescription, and avoid changing the dose independently. Most importantly, persistent or unexplained coughing should be evaluated rather than repeatedly suppressed. Treating the underlying cause is often more important than simply reducing the cough reflex.