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Benadryl Syrup

Written By Dr. Sakshi Jain, MS, BDS
Reviewed By Dr. Rajeev Sharma, MBA, MBBS
Last updated on 16 Apr 2026 | 04:05 PM (IST)
Benadryl Syrup is used in the treatment of cough. It relieves allergy symptoms such as a runny nose, a stuffy nose, sneezing, watery eyes, and congestion or stuffiness. It also thins mucus in the nose, windpipe, and lungs, making it easier to cough out.
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Benadryl Syrup image
Benadryl Syrup image
Benadryl Syrup image
Benadryl Syrup image
Benadryl Syrup image

Product introduction

Benadryl Syrup is taken with or without food in a dose and duration as advised by the doctor. The dose you are given will depend on your condition and how you respond to the medicine. You should keep taking this medicine for as long as your doctor recommends. If you stop treatment too early, your symptoms may come back, and your condition may worsen. Let your healthcare team know about all other medications you are taking, as some may affect, or be affected by, this medicine.


The most common side effects of this medicine include drowsiness, inability to concentrate, fatigue, dizziness, hypotension, muscular weakness, and impaired coordination. Most of these are temporary and usually resolve with time. Contact your doctor if you are at all concerned about any of these side effects. Avoid drinking alcohol while taking this medicine, as it can make dizziness worse.


Never support self-medication or recommend your medicine to another person. It is beneficial to have plenty of fluids while taking this medication. Before you start taking this medicine, it is important to inform your doctor if you are suffering from liver or kidney disease. You should also tell your doctor if you are pregnant, planning pregnancy, or breastfeeding. This medicine may cause dizziness and sleepiness, so do not drive or do anything that requires mental focus until you know how this medicine affects you.

Uses of Benadryl Syrup

  • Treatment of Cough : Benadryl Syrup helps relieve cough by clearing mucus or reducing irritation in the airways.

Benefits of Benadryl Syrup

Treatment of Cough
Benadryl Syrup is a combination medicine that helps relieve cough and associated symptoms. It works by loosening thick mucus, making it easier to cough out, and clearing the airways. It also reduces allergy-related symptoms such as sneezing, runny nose, watery eyes, and throat irritation. This helps improve breathing and provides overall comfort.

Side effects of Benadryl Syrup

Most side effects do not require any medical attention and disappear as your body adjusts to the medicine. Consult your doctor if they persist or if you’re worried about them
Common side effects of Benadryl
  • Stomach pain/epigastric pain
  • Dizziness
  • Sleepiness
  • Impaired coordination
  • Thickened respiratory tract secretions
  • Allergic reaction

How to use Benadryl Syrup

Take this medicine in the dose and duration as advised by your doctor. Check the label for directions before use. Measure it with a measuring cup and take it by mouth. Shake well before use. Benadryl Syrup may be taken with or without food.

How Benadryl Syrup works

Benadryl Syrup is a combination of three medicines: diphenhydramine, ammonium chloride, and sodium citrate. Diphenhydramine is an antihistamine that relieves allergy symptoms such as a runny nose, watery eyes, and sneezing. Ammonium chloride is an expectorant that helps loosen mucus (phlegm) and make it easier to remove from the airways. Sodium citrate helps thin and loosen mucus, making it easier to cough out.

Quick tips

  • Benadryl Syrup may cause dizziness or sleepiness, so avoid driving or operating machinery until you know how it affects you.
  • Avoid alcohol or other sedating medicines while taking Benadryl Syrup, as they may increase drowsiness.
  • Use a proper measuring cup or spoon to measure the dose, not a household tablespoon.
  • Dry mouth or constipation may occur; staying hydrated and maintaining fiber intake may help.
  • Do not combine Benadryl Syrup with other cough or cold medicines containing antihistamines or sedatives unless advised by your doctor.
  • If you have diabetes, monitor your blood glucose levels while taking Benadryl Syrup.
  • Inform your doctor if you have a history of thyroid disease, heart disease, glaucoma, or urinary retention before using Benadryl Syrup.
  • Avoid smoking or exposure to secondhand smoke, as it may worsen cough and throat irritation.
  • Seek medical attention if you develop a high fever, chest pain, breathlessness, or cough up blood.
  • Stop taking Benadryl Syrup and consult your doctor if cough lasts more than about one week, keeps recurring, or occurs with fever, rash, or persistent headache.
  • Stop the medicine and seek urgent medical help if rash, swelling of the face, or breathing difficulty occurs.

Safety advice

Alcohol

Alcohol

UNSAFE
Do not drink alcohol while you are taking this medicine. Benadryl Syrup may cause excessive drowsiness when taken with alcohol.
Pregnancy

Pregnancy

UNSAFE
Benadryl Syrup is highly unsafe during pregnancy. It can cause serious harm to the unborn baby, including birth defects and pregnancy loss. Do not use this medicine if you are pregnant or planning to become pregnant.
Breast feeding

Breast feeding

CAUTION
Benadryl Syrup should be used with caution during breastfeeding. Breastfeeding should be held until the treatment of the mother is completed and the drug is eliminated from the body.
Driving

Driving

UNSAFE
Benadryl Syrup may decrease alertness, affect your vision, or make you feel sleepy and dizzy. Do not drive if these symptoms occur.
Kidney

Kidney

UNSAFE
Benadryl Syrup is unsafe to use in patients with kidney disease and should be avoided.
Liver

Liver

CAUTION
Benadryl Syrup should be used with caution in patients with liver disease. Dose adjustment may be needed.

Frequently asked questions

Yes, Benadryl Syrup may make you feel drowsy or sleepy during daily activities. Avoid driving, operating machinery, working at heights, or doing activities that require alertness until you know how the medicine affects you. Inform your doctor if excessive drowsiness occurs while using Benadryl Syrup.
Benadryl Syrup is used to relieve symptoms of cough, cold, and allergies such as dry cough, sneezing, runny or blocked nose, throat irritation, and mild fever. It works through a combination of medicines that reduce the cough reflex, control allergy symptoms, and ease nasal congestion.
Benadryl Syrup may cause side effects in some people, including stomach upset, nausea, dizziness, drowsiness, dry mouth, or loose stools. These effects are usually mild and temporary. Contact your doctor if severe rash, breathing difficulty, extreme sleepiness, or other unusual symptoms occur.
Benadryl Syrup may start providing relief within a short time after taking it, but the exact timing can vary depending on the ingredients and the severity of symptoms.
Benadryl Syrup should be used only for the duration advised by your doctor. Regular or long-term use without medical guidance may increase the risk of side effects.
Benadryl Syrup can usually be taken after food if it causes stomach discomfort. Follow your doctor’s advice regarding the exact timing and dosing schedule.
It is generally best to avoid alcohol while taking Benadryl Syrup because alcohol may increase side effects such as drowsiness, dizziness, stomach irritation, or dehydration.
Benadryl Syrup should not be combined with other cold or cough medicines without consulting a doctor because some products may contain similar ingredients, which could increase the risk of side effects.
If you miss a dose of Benadryl Syrup, take the next scheduled dose at the usual time unless your doctor advises otherwise. Do not take two doses together to make up for the missed dose.
Benadryl Syrup should be given to children only if recommended by a doctor. The correct dose depends on the child’s age, weight, and symptoms. Seek medical help if the child becomes unusually sleepy, breathless, refuses fluids, or develops a rash.

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RESPIRATORY
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User feedback

Twice A Day
40%
Once A Day
40%
Thrice A Day
20%
Cough
76%
Cough with mucus
12%
Others
9%
Allergic conditions
2%
Average
44%
Excellent
37%
Poor
20%
No Side Effect
48%
Dizziness
15%
Sleepiness
15%
Impaired coordination
7%
Facial swelling
4%
With or without food
60%
With food
40%
Average
54%
Expensive
26%
Not Expensive
20%
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Disclaimer

Tata 1mg's sole intention is to ensure that its consumers get information that is expert-reviewed, accurate and trustworthy. However, the information contained herein should NOT be used as a substitute for the advice of a qualified physician. The information provided here is for informational purposes only. This may not cover everything about particular health conditions, lab tests, medicines, all possible side effects, drug interactions, warnings, alerts, etc. Please consult your doctor and discuss all your queries related to any disease or medicine. We intend to support, not replace, the doctor-patient relationship.

Marketer details

Name: JNTL Consumer Health (India) Pvt. Ltd.
Address: LBS Marg Mulund (West), Mumbai 400080, India

Vendor Details

Country of origin: India
A licensed vendor partner from your nearest location will deliver Benadryl Syrup. Once the pharmacy accepts your order, the details of the pharmacy will be shared with you. Acceptance of your order is based on the validity of your doctor's ℞ and the availability of this medicine.

In case of any issues, contact us

Email ID: [email protected]
Phone Number: 0124-4166666
Address: 5th Floor Tower - B of the Presidency Building, 46/4 Mehrauli Gurgaon Road, Sector 14, Gurugram, Haryana-122001, India
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