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Name/scientific name

DIPHENHYDRAMINE

Self-financed or subsidized by the Hospital Authority

Hospital Authority Drug Formulary

Indications

Allergic Reactions, Insomnia, Itchy Skin, Cold Symptoms, Rhinitis, Seasonal Allergies, Urticaria

body system

respiratory system

type 

Antihistamines and emergency allergies

Drug introduction

Diphenhydramine is a medicine used to treat allergic reactions and trouble sleeping. It is an antihistamine drug that reduces the body's response to allergens, thereby relieving allergy symptoms such as itching and hives. Additionally, it is a sedative and can be used to treat insomnia.

In Hong Kong, Diphenhydramine is usually taken in oral pill or liquid form. Use as recommended by your doctor or pharmacist and avoid exceeding the recommended dose. Possible side effects include drowsiness, dry mouth, and dizziness.

For pregnant women, lactating women and the elderly, this drug should be used under the guidance of a doctor. Also, use with other sedatives or alcohol should be avoided to avoid increasing the risk of drowsiness.

If you have any questions or adverse reactions, you should consult your doctor immediately. This medication should not be used in children unless directed by your doctor.

Dosage

Instructions for use: The medication should be taken orally and a glass of water should be consumed before each dose. It is recommended to take it before bed to reduce symptoms of allergic reactions or insomnia. It is not recommended to take it on an empty stomach, it is best to take it with food to reduce stomach upset. Avoid drinking alcohol or engaging in activities that require alertness while taking this product.

Dosage Guidelines: It is recommended that adults take 25-50 mg each time, and the maximum dose does not exceed 300 mg daily. The dosage for children should be based on age and weight. It is generally recommended to take 0.5 mg/kg each time and no more than 3 times a day. For the elderly or patients with liver or kidney function problems, the dose should be reduced to avoid adverse reactions. Small doses should be tested initially and the dose should be adjusted based on effects, but should not exceed the maximum recommended dose. If serious adverse reactions occur, stop use and seek medical advice immediately.

side effect

DIPHENHYDRAMINE is a common anti-allergic drug, mainly used to treat allergic reactions and relieve sleep problems. However, its side effects include dry throat, dizziness, vomiting, diarrhea and drowsiness. Some people may experience skin sensitivity, such as red rash or itching. Long-term use may lead to drug resistance and the dosage may need to be increased to take effect. If you have serious side effects, such as fast heartbeat, difficulty breathing, or confusion, seek medical advice immediately. Before seeing a doctor, remember to tell the doctor clearly about your allergies and use of other medications to avoid adverse reactions.

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Taboo

DIPHENHYDRAMINE is a common antihistamine drug used to treat allergic reactions, cold symptoms, and sleep problems. However, the following contraindications should be noted when using DIPHENHYDRAMINE:

1. Allergic reaction: Before using DIPHENHYDRAMINE, patients should ensure that they are not allergic to this drug or similar antihistamine drugs. If allergy symptoms such as rash, allergic rhinitis, or difficulty breathing occur, discontinue use and seek medical advice immediately.

2. Glaucoma: People with glaucoma should avoid using DIPHENHYDRAMINE because the drug may aggravate the increase in intraocular pressure and lead to more serious eye problems.

3. Prostatic hypertrophy: Men with prostatic hypertrophy should avoid using DIPHENHYDRAMINE because the drug may worsen symptoms such as frequent urination and urgency.

4. Pregnancy and lactation: Pregnant and lactating women should use DIPHENHYDRAMINE under the guidance of a physician to avoid adverse effects on the fetus or infant.

In summary, personal conditions and medical history should be carefully evaluated before using DIPHENHYDRAMINE to ensure that the above contraindications are avoided. If you have any questions or discomfort, you should seek advice from your doctor or pharmacist immediately.

Precautions

DIPHENHYDRAMINE

Precautions for use: This drug is an antihistamine drug, mainly used to treat allergic reactions and nasal sensitivity. Please note that it may cause drowsiness and affect reaction speed when using it. Do not drive a motor vehicle or operate machinery. Do not use it together with alcohol to avoid increasing the drowsiness effect. If you have any discomfort or questions, please consult your doctor or pharmacist.

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  • Medication grading for pregnant women

    Diphenhydramine should be used with caution during pregnancy as this drug may affect fetal health. If you are pregnant or planning to become pregnant, you should consult your doctor before taking any medication. Diphenhydramine is an antihistamine drug commonly used to treat allergy symptoms, trouble sleeping, and cold symptoms. However, long-term or large amounts of this drug should be avoided during pregnancy.

    Using diphenhydramine during pregnancy may increase the risk of birth defects in the child. To protect the health of the fetus, this medication should be avoided if possible, especially early in pregnancy. In all cases, Diphenhydramine should be used under a doctor's supervision and according to your doctor's recommendations. It is important to tell your doctor about your pregnancy to ensure that the best treatment is chosen for you.

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