Generic Name: clemastine and phenylpropanolamine (KLEM as teen/fen ill proe pa NOLE a meen)
Brand Names: Allerhist-D, Dayhist-D, Tavist-D
What is Allerhist-D (clemastine and phenylpropanolamine)?
Clemastine is an antihistamine. It blocks the effects of the naturally occurring chemical histamine in the body. Clemastine prevents sneezing; itchy, watery eyes and nose; and other symptoms of allergies and hay fever.
Phenylpropanolamine is a decongestant. It constricts (shrinks) blood vessels (veins and arteries). This reduces the blood flow to certain areas and allows nasal and respiratory (breathing) passages to open up.
Clemastine and phenylpropanolamine is used to treat nasal congestion and sinusitis (inflammation of the sinuses) associated with allergies and hay fever.
Phenylpropanolamine, an ingredient in this product, has been associated with an increased risk of hemorrhagic stroke (bleeding into the brain or into tissue surrounding the brain) in women. Men may also be at risk. Although the risk of hemorrhagic stroke is low, the U.S. Food and Drug Administration (FDA) recommends that consumers not use any products that contain phenylpropanolamine.
Clemastine and phenylpropanolamine may also be used for purposes other than those listed in this medication guide.
What is the most important information I should know about Allerhist-D (clemastine and phenylpropanolamine)?
Phenylpropanolamine, an ingredient in this product, has been associated with an increased risk of hemorrhagic stroke (bleeding into the brain or into tissue surrounding the brain) in women. Men may also be at risk. Although the risk of hemorrhagic stroke is low, the U.S. Food and Drug Administration (FDA) recommends that consumers not use any products that contain phenylpropanolamine.
Use caution when driving, operating machinery, or performing other hazardous activities. Clemastine and phenylpropanolamine may cause dizziness or drowsiness. If you experience dizziness or drowsiness, avoid these activities. Use alcohol cautiously. Alcohol may increase drowsiness and dizziness while taking clemastine and phenylpropanolamine.
Do not take more of this medication than is recommended. If your symptoms do not improve, or if they worsen, talk to your doctor.
Who should not take Allerhist-D (clemastine and phenylpropanolamine)?
Do not take clemastine and phenylpropanolamine if you have taken a monoamine oxidase inhibitor (MAOI) such as isocarboxazid (Marplan), phenelzine (Nardil), or tranylcypromine (Parnate) in the last 14 days. A dangerous drug interaction could occur, leading to serious side effects.
Before taking this medication, tell your doctor if you have
- kidney disease,
- liver disease,
diabetes,
glaucoma,
any type of heart disease or high blood pressure,
thyroid disease, or
difficulty urinating or an enlarged prostate.
You may not be able to take clemastine and phenylpropanolamine, or you may require a dosage adjustment or special monitoring during treatment if you have any of the conditions listed above.
Clemastine and phenylpropanolamine is in the FDA pregnancy category B. This means that it is unlikely to harm an unborn baby. Do not take this medication without first talking to your doctor if you are pregnant. This medication passes into breast milk and may harm a nursing baby. Do not take this medication without first talking to your doctor if you are breast-feeding a baby. If you are over 65 years of age, you may be more likely to experience side effects from clemastine and phenylpropanolamine. You may require a lower dose of this medication. Read the package label for directions or consult your doctor or pharmacist before treating a child with this medication. Children are more susceptible than adults to the effects of medicines and may have unusual reactions. Clemastine and phenylpropanolamine is not approved for use by children younger than 12 years of age.
How should I take Allerhist-D (clemastine and phenylpropanolamine)?
Take clemastine and phenylpropanolamine exactly as directed. If you do not understand these directions, ask your pharmacist, nurse, or doctor to explain them to you.
Take each dose with a full glass of water. Do not crush, chew, or break the tablets. Swallow them whole. They are specially formulated to release slowly over 12 hours. Do not take more than one tablet every 12 hours. If one tablet per day controls your symptoms, use that dosage. Never take more than two tablets in 1 day. Taking too much of this medication could cause severe dizziness, insomnia, and nervousness.
Do not take clemastine and phenylpropanolamine for longer than 7 days in a row. If your symptoms do not improve, if they get worse, or if you have a fever, talk to your doctor.
Store clemastine and phenylpropanolamine at room temperature away from moisture and heat.
What happens if I miss a dose?
Take the missed dose as soon as you remember. However, if it is almost time for the next dose, skip the missed dose and take only the next regularly scheduled dose. Do not take a double dose of this medication.
What happens if I overdose?
Seek emergency medical attention.
Symptoms of a clemastine and phenylpropanolamine overdose include a dry mouth, large pupils, flushing, nausea, and vomiting.
What should I avoid while taking Allerhist-D (clemastine and phenylpropanolamine)?
Use caution when driving, operating machinery, or performing other hazardous activities. Clemastine and phenylpropanolamine may cause dizziness or drowsiness. If you experience dizziness or drowsiness, avoid these activities. Use alcohol cautiously. Alcohol may increase drowsiness and dizziness while taking clemastine and phenylpropanolamine.
Allerhist-D (clemastine and phenylpropanolamine) side effects
Serious side effects are unlikely to occur. Stop taking clemastine and phenylpropanolamine and seek emergency medical attention if you experience an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives).
Other, less serious side effects may be more likely to occur. Continue to take clemastine and phenylpropanolamine and talk to your doctor or try another similar medication if you experience
dryness of the eyes, nose, and mouth;
drowsiness or dizziness;
blurred vision;
difficulty urinating; or
excitation in children.
Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.
What other drugs will affect Allerhist-D (clemastine and phenylpropanolamine)?
Do not take clemastine and phenylpropanolamine if you have taken a monoamine oxidase inhibitor (MAOI) such as isocarboxazid (Marplan), phenelzine (Nardil), or tranylcypromine (Parnate) in the last 14 days. A dangerous drug interaction could occur, leading to serious side effects.
Do not take other over-the-counter cough, cold, allergy, diet, or sleep aids while taking clemastine and phenylpropanolamine without first talking to your doctor or pharmacist. Other medications may also contain clemastine, phenylpropanolamine, or other similar drugs. You may accidentally take too much of these medicines.
Clemastine and phenylpropanolamine may increase the effects of other drugs that cause drowsiness, including antidepressants, alcohol, other antihistamines, pain relievers, anxiety medicines, seizure medicines, and muscle relaxants. Dangerous sedation, dizziness, or drowsiness may occur if clemastine and phenylpropanolamine is taken with any of these medications.
Drugs other than those listed here may also interact with clemastine and phenylpropanolamine. Talk to your doctor and pharmacist before taking any prescription or over-the-counter medicines, including herbal products.
More Allerhist-D resources
- Allerhist-D Side Effects (in more detail)
- Allerhist-D Use in Pregnancy & Breastfeeding
- Allerhist-D Drug Interactions
- Allerhist-D Support Group
- 0 Reviews for Allerhist-D - Add your own review/rating
Compare Allerhist-D with other medications
- Cold Symptoms
Where can I get more information?
- Your pharmacist has additional information about clemastine and phenylpropanolamine written for health professionals that you may read.
What does my medication look like?
Clemastine and phenylpropanolamine is available with a prescription under the brand name Tavist-D. Other brand or generic formulations may also be available. Ask your pharmacist any questions you have about this medication, especially if it is new to you.
Tavist-D 1 mg of clemastine and 75 mg of phenylpropanolamine-- round, white tablets
See also: Allerhist-D side effects (in more detail)
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