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Duohist DH liquid
Generic Name: chlorpheniramine/dihydrocodeine/phenylephrine (KLOR-fen-IR-a-meen/dye-HYE-droe-KOE-deen/FEN-il-EF-rin)
Brand Name: Examples include Duohist DH and Despec-PD
Some children have had serious and sometimes fatal breathing problems when using codeine after surgery to remove tonsils or adenoids. Talk with your doctor for more information.
Duohist DH liquid is used for:
Treating symptoms of the common cold, flu, or hay fever, and other upper respiratory allergies such as cough, congestion, runny nose, sneezing, itching of the nose and throat, and itchy, watery eyes. It may also be used for other conditions as determined by your doctor.
Duohist DH liquid is a narcotic antitussive (cough suppressant), antihistamine, and decongestant combination. The antitussive works by suppressing the cough center in the brain. The antihistamine works by blocking the action of histamine, which reduces the symptoms of an allergic reaction such as itchy, watery eyes and runny nose. The decongestant shrinks swollen nasal passages, which relieves nasal congestion.
Do NOT use Duohist DH liquid if:
- you are allergic to any ingredient in Duohist DH liquid or any other codeine-related medicine (eg, codeine)
- you have diarrhea associated with poisoning, antibiotic use, or a bacterial infection (from eating or drinking contaminated food or water)
- you have severe high blood pressure, severe heart blood vessel disease, rapid heartbeat, or severe heart problems
- you are taking sodium oxybate (GHB) or you have taken furazolidone or a monoamine oxidase inhibitor (MAOI) (eg, phenelzine) within the last 14 days
- the patient is a child and has just had surgery to remove tonsils or adenoids
Contact your doctor or health care provider right away if any of these apply to you.
Before using Duohist DH liquid:
Some medical conditions may interact with Duohist DH liquid. Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:
- if you are pregnant, planning to become pregnant, or are breast-feeding
- if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
- if you have allergies to medicines, foods, or other substances
- if you have a history of alcohol or drug abuse, dependence on narcotics, or suicidal thoughts or behaviors
- if you have increased pressure in the head, an unusual growth in the brain (eg, tumor), a recent head injury, Parkinson disease, Reye syndrome, the blood disease porphyria, or a blockage of your stomach, bowel, or bladder
- if you have a history of epilepsy or seizures, asthma or other breathing problems (eg, sleep apnea), stomach or intestinal problems, chronic constipation, liver problems, glaucoma, an enlarged prostate gland or other prostate problems, difficulty urinating, heart problems, diabetes, high blood pressure, blood vessel problems, adrenal gland problems, overactive thyroid, seizures, or stroke
- if you have recently had abdominal surgery
Some MEDICINES MAY INTERACT with Duohist DH liquid. Tell your health care provider if you are taking any other medicines, especially any of the following:
- Barbiturate anesthetics (eg, thiopental), beta-blockers (eg, propranolol), cimetidine, catechol-O-methyltransferase (COMT) inhibitors (eg, tolcapone), furazolidone, indomethacin, ketorolac, MAOIs (eg, phenelzine), naltrexone, sodium oxybate (GHB), or tricyclic antidepressants (eg, amitriptyline) because they may increase the risk of Duohist DH liquid's side effects, including dangerous sleepiness and a decrease in the ability to breathe
- Digoxin or droxidopa because the risk of irregular heartbeat or heart attack may be increased
- Rifampin or risperidone because they may decrease Duohist DH liquid's effectiveness
- Bromocriptine or hydantoins (eg, phenytoin) because their actions and the risk of their side effects may be increased by Duohist DH liquid
- Guanadrel, guanethidine, mecamylamine, methyldopa, mexiletine, or reserpine because their effectiveness may be decreased by Duohist DH liquid
- Naltrexone because it may decreases Duohist DH liquid's effectiveness and withdrawal symptoms may occur in patients who have become physically dependent on opioids. You must not take naltrexone until you have stopped taking Duohist DH liquid for 7 to 10 days and after a naloxone challenge test is negative.
This may not be a complete list of all interactions that may occur. Ask your health care provider if Duohist DH liquid may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.
How to use Duohist DH liquid:
Use Duohist DH liquid as directed by your doctor. Check the label on the medicine for exact dosing instructions.
- Take Duohist DH liquid by mouth with or without food. If stomach upset occurs, take with food to reduce stomach irritation.
- Use a measuring device marked for medicine dosing. Ask your pharmacist for help if you are unsure of how to measure your dose.
- If you miss a dose of Duohist DH liquid and you are taking it regularly, take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.
Ask your health care provider any questions you may have about how to use Duohist DH liquid.
Important safety information:
- Duohist DH liquid may cause drowsiness or dizziness. These effects may be worse if you take it with alcohol or certain medicines. Use Duohist DH liquid with caution. Do not drive or perform other possibly unsafe tasks until you know how you react to it.
- Do not drink alcohol or use medicines that may cause drowsiness (eg, sleep aids, muscle relaxers) while you are using Duohist DH liquid; it may add to their effects. Ask your pharmacist if you have questions about which medicines may cause drowsiness.
- If your symptoms do not get better within 7 days or if they get worse, or if you develop a high fever or persistent headache, check with your doctor.
- Use Duohist DH liquid with caution in the ELDERLY; they may be more sensitive to its effects, especially possible breathing problems and drowsiness.
- Duohist DH liquid should be used with extreme caution in CHILDREN; safety and effectiveness in children have not been confirmed.
- PREGNANCY and BREAST-FEEDING: It is not known if Duohist DH liquid can cause harm to the fetus. If you become pregnant, contact your doctor. You will need to discuss the benefits and risks of using Duohist DH liquid while you are pregnant. Duohist DH liquid is found in breast milk. If you are or will be breast-feeding while you use Duohist DH liquid, check with your doctor. Discuss any possible risks to your baby.
When used for long periods of time or at high doses, Duohist DH liquid may not work as well and may require higher doses to obtain the same effect as when originally taken. This is known as TOLERANCE. Talk with your doctor if Duohist DH liquid stops working well. Do not take more than prescribed.
When used for longer than a few weeks or at high doses, some people develop a need to continue taking Duohist DH liquid. This is known as DEPENDENCE or addiction. If you suddenly stop taking Duohist DH liquid, you may experience WITHDRAWAL symptoms including anxiety; diarrhea; fever, runny nose, or sneezing; goose bumps and abnormal skin sensations; nausea; vomiting; pain; rigid muscles; rapid heartbeat; seeing, hearing, or feeling things that are not there; shivering or tremors; sweating; and trouble sleeping.
Possible side effects of Duohist DH liquid:
All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:
Seek medical attention right away if any of these SEVERE side effects occur:
Constipation; dizziness; drowsiness; dry mouth, throat, or nose; excitement; nausea; stomach upset; thickening or mucus in nose or throat.
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); difficulty urinating; fast or irregular heartbeat; flushing or redness of face.
This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. To report side effects to the appropriate agency, please read the Guide to Reporting Problems to FDA.
If OVERDOSE is suspected:
Contact 1-800-222-1222 (the American Association of Poison Control Centers), your local poison control center, or emergency room immediately. Symptoms may include agitation; coma; confusion; deep sleep or loss of consciousness; difficulty breathing; diminished mental alertness; hallucinations; hot or cold skin; large and unchanging pupils; sedation; seizures; shaking; sleeplessness; slow heartbeat; slowed breathing.Proper storage of Duohist DH liquid:
Store Duohist DH liquid at room temperature, between 59 and 86 degrees F (15 and 30 degrees C). Store away from heat, moisture, and light. Do not store in the bathroom. Keep Duohist DH liquid out of the reach of children and away from pets.
- If you have any questions about Duohist DH liquid, please talk with your doctor, pharmacist, or other health care provider.
- Duohist DH liquid is to be used only by the patient for whom it is prescribed. Do not share it with other people.
- If your symptoms do not improve or if they become worse, check with your doctor.
- Check with your pharmacist about how to dispose of unused medicine.
This information should not be used to decide whether or not to take Duohist DH liquid or any other medicine. Only your health care provider has the knowledge and training to decide which medicines are right for you. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about Duohist DH liquid. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to Duohist DH liquid. This information is not specific medical advice and does not replace information you receive from your health care provider. You must talk with your healthcare provider for complete information about the risks and benefits of using Duohist DH liquid.