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Why it's used

Zenaro Syrup is used to relieve seasonal and year-round allergies. This medicine works by blocking certain organic substances, called histamines, in the brain and other areas of the body. Zenaro is also used to treat severe allergies due to food, medicines, or other causes. This medicine helps by treating the symptoms of the allergic reaction including skin rashes.
Zenaro belongs to a class of medicines called Antihistamines. Antihistamines help in relieving allergic symptoms. They do so by blocking the effects of histamines. Histamines are produced by the body and in-turn cause fever, itching, sneezing, a runny nose, or watery eyes in allergic conditions.

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How to use

Read the medicine guide provided by your pharmacist, your doctor, or the medicine company. If you have any questions related to Zenaro, ask your doctor or pharmacist. Use Zenaro Syrup as per the instructions provided by your doctor.
Zenaro is consumed with or without food. Take this medicine as a single dose. Zenaro is consumed usually in the evening. This is because Zenaro may cause dizziness.

Typical Dosage

The typical dose of Zenaro for adults is 5 mg once a day. The usual dose for children is 2.5 mg once a day. Zenaro is commonly used at the same time every day. It takes 1 hour for this medicine to start its action. This medicine is not known to be addictive or habit-forming.
This medicine should be used on an as-needed basis. If used for the treatment of allergies, the medicine can be stopped once the symptoms have disappeared and can be restarted again if symptoms reappear. If you experience symptoms for more than four days a week or for more than four weeks a year, your doctor may ask you to continue the treatment. Your treatment may continue as long as you are exposed to substances that cause your allergy.
If using the liquid form of this medicine, measure the dose using the provided measuring cup, spoon, or dropper. Before pouring the medicine into the measuring device, you should check the measurement markings carefully. Then, pour the dose amount into the device. After use, clean and store the measuring device in a safe place for your next use. You should not use a tablespoon or teaspoon as the dose measuring devices since it can result in an incorrect dose. If indicated on the product package, shake the medicine before use.

Talk to Your Doctor

Discuss with your doctor if your condition does not improve. If you have any kidney disease, a low dose of Zenaro will usually be given.
Taking a higher dose of this medicine may increase the risk of side-effects. Older patients may see an increase in the incidence of side-effects. As a result, a lower dose may be recommended for older patients.

Use in Children

If you are giving Zenaro Syrup to a child, be sure to use a product that is for use in children. Use the child's weight or age to find the right dose from the product package or medicine label. You can also read the dosage section of this page to know the correct dose for your child. Else, consult with your doctor and follow their recommendation.

Avoid Alcohol

Avoid consuming alcohol together with Zenaro.
Medicines may be recommended for uses other than those listed in the medicine guide. You should not use Zenaro Syrup for conditions or symptoms for which it was not prescribed. Do not give Zenaro Syrup to other people, even if they have the same conditions or symptoms that you have. The use of this medicine without the advice of a doctor may cause harm.


Follow storage instructions on the product package if available. Store Zenaro Syrup at 20-25°C (68-77°F). Store this medicine away from children and pets.

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How to take Zenaro

Your dose may depend on several personal factors. You should consult with your doctor to find out the dose that is best for you. The dose of Zenaro depends on the following factors:
  • patient's age
  • patient's weight
  • patient's health
  • the health of the patient's liver
  • medicines recommended by your doctor
  • any other medicines in use
  • herbal supplements consumed

Zenaro Dosage

Dosage for a sore throat, runny nose, and eye irritation

Adult (12 years and older)
  • Recommended: 5 mg once daily in the evening
  • Maximum: 5 mg once daily in the evening
Children (6 - 11 years)
  • Recommended: 2.5 mg once daily in the evening
  • Maximum: 2.5 mg once daily in the evening
Older Adults
  • Recommended: 5 mg once daily in the evening

Dosage for severe allergies

Adult (12 years and older)
  • Recommended: 5 mg once daily in the evening
Children (6 - 11 years)
  • Recommended: 2.5 mg once daily in the evening
  • Maximum: 2.5 mg once daily in the evening
Older Adults
  • Recommended: 2.5 mg once daily in the evening

Minimum Age

6 years

Dosage calculation for children

To calculate the dosage for children please use the weight based dose calculator to calculate the appropriate dosage as per the weight of your child.


Strength: 5 mg
Oral solution
Strength: 0.5 mg/mL

Special Instructions

Dosage for minor kidney issues
In this condition, the recommended dose is 2.5 mg once a day.
Dosage for moderate kidney issues
In this condition, the recommended dose is 2.5 mg once every two days.
Dosage for severe kidney issues
In this condition, the recommended dose is 2.5 mg once every three days.
Take this medicine in a single dose.
Oral solution
Take this oral solution daily without regard to meals.

Missed Dose

Skip the missed dose and take the next dose as per your regular schedule.


What to do if you overdose on Zenaro?
No specific solution is known to cancel the effects of an overdose of Zenaro.
Symptoms of an overdose of Zenaro
If you use too much of this medicine, it could lead to dangerous levels of the medicine in your body. In such cases, symptoms of an overdose may include:
  • agitation
  • drowsiness
  • restlessness
If you think you have overdosed on Zenaro Syrup, call a poison control center immediately. You can look up the poison control center information from the Poison Center Finder at

Precautions while using Zenaro

Before you use Zenaro, tell your doctor of your medical and health history including the following:
The risk of side-effects is higher in patients with kidney disease.
Before you use Zenaro, tell your doctor if you are allergic to it or its ingredients. Your doctor may prescribe an alternative medicine and update your medical records to record this information.
The use of Zenaro Syrup may change function of the kidneys. If you have a kidney disease, the functioning of your kidneys should be monitored regularly.

Use when Pregnant

Zenaro should be used only when required in patients who are pregnant or planning to become pregnant.

If Breastfeeding

Zenaro Syrup is not safe for use in women who are breastfeeding. If you are breastfeeding, discuss with your doctor if you should either discontinue breastfeeding, or stop using this medicine during this period. This medicine may pass into breast milk and hence use in mothers who breastfeed is not recommended.

If trying to Conceive

It is not known if this medicine is safe for use in women who are conceiving. Consult with your doctor before you use Zenaro.


Avoid drinking alcohol with Zenaro. Consumption of alcohol may cause with Zenaro leads to a reduction in alertness and can cause accidents if you are driving, operating any machine, or any other activity that requires full mental awareness.


Zenaro can make you feel sleepy. Be careful, especially while driving, while using heavy machinery, or when doing any activity that needs you to be completely alert. The consumption of alcohol with Zenaro can worsen the sleepiness.

Zenaro Side-effects

The following side-effects may commonly occur when using Zenaro Syrup. If any of these side-effects worsen or last for a long time, you should consult with your doctor:
The following side-effects may commonly occur in children when using Zenaro Syrup. Discuss with your doctor if any of these side-effects last for a long time or are severe:
Rarely, the use of Zenaro Syrup may cause the following side-effects:
  • abnormal liver function
  • confusion
  • depression
  • feeling of anger
  • hallucination
  • increase in the rate of the heartbeat
  • painful urination
  • sleeplessness
  • swelling from excessive accumulation of fluid in tissues
  • uncontrollable body movements
  • uncontrolled urination
The following severe side-effects may also occur when using Zenaro Syrup:
  • Life-threatening allergic reaction
    Symptoms: irritation in the eyes, swelling in the throat shortness of breath
Your doctor has prescribed Zenaro Syrup because they judge that the benefit is greater than the risk posed by side-effects. Many people using this medicine do not have serious side-effects. This page does not list all possible side-effects of Zenaro Syrup.
If you experience side-effects or notice other side-effects not listed above, contact your doctor for medical advice. You may also report side-effects to your local food and drug administration authority. You can look up the drug authority contact information from the Drug Authority Finder at


Hazardous Occupations

Patients engaged in hazardous occupations are at an increased risk when using this medicine as this medicine causes you to feel tired, drowsy, and sleepy. Patients should not drive, or use machines, or get involved in activities that require mental alertness while using this medicine.

Alcohol Consumption

Patients who drink alcohol are at an increased risk when using this medicine. Reduction in alertness can happen when using Zenaro with alcohol. As a result, this medicine should not be used in patients who drink alcohol.

Central Nervous System Depressants

Patients using medicines called as "central nervous system depressants" are at an increased risk when using this medicine. These patients may have a reduction in alertness. Such patients should be monitored closely for these changes.

Interactions with Zenaro

When two or more medicines are taken together, it can change how the medicines work and increase the risk of side-effects. In medical terms, this is called as a Drug Interaction.
This page does not contain all the possible interactions of Zenaro Syrup. Share a list of all medicines that you use with your doctor and pharmacist. Do not start, stop, or change the dose of any medicines without the approval of your doctor.

Central Nervous System Depressants

Zenaro Syrup interacts with central nervous system depressants which are used to slow down the brain activities. Using Zenaro with brain depressants may lead to a greater reduction in mental awareness.

Antiviral Drugs

There may be an interaction of Zenaro with ritonavir, which is used to treat HIV infections. Ritonavir decreases the removal of Zenaro from the body. This can increase the effects of Zenaro on the body.

Xanthine Derivatives

Zenaro Syrup may interact with theophylline, which is used to treat asthma and other lung related problems. Theophylline reduces the removal of Zenaro from the body. This can increase the effects of Zenaro on the bidy.


Special instructions need to be followed while taking this medicine along with cetrizine, which is used to treat allergies. Zenaro increases the effects of cetrizine on the body.

Expired Medication

Taking a single dose of expired Zenaro is unlikely to cause a side-effect. However, please discuss with your doctor or pharmacist, if you feel unwell or sick. An expired medicine may become ineffective in treating your prescribed conditions. To be on the safe side, it is important not to use an expired drug. You are much safer by always keeping a fresh supply of unexpired medicines.

Safe Disposal of Medication

  • If there are disposal instructions on the package, please follow the instructions.
  • If there are medicine take-back programs in your country, you should contact the respective authority to arrange for the disposal of the medicine. For example, in the USA, the Drug Enforcement Administration regularly hosts National Prescription Drug Take-Back events.
  • If there are no take-back programs, mix the medicine with dirt and place them in a sealed plastic bag. Throw the plastic bag in your household trash. Separately, remove all personal information including the prescription label from the medicine packaging and then dispose off the container.
  • If specifically indicated on the medicine package that it needs to be flushed down the toilet when no longer needed, perform the required step.
This page provides information for Zenaro Syrup .
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