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Monast LC Syrup is a combination medicine used to treat symptoms of allergic rhinitis, such as a runny or stuffy nose, sneezing, itching, swelling, watery eyes, and congestion. It also reduces airway inflammation and makes breathing easier. It works by blocking a substance that causes allergy in the body.

Written By Dr. Swati Mishra, BDS,
Reviewed By Dr. Sachin Gupta, MD Pharmacology, MBBS,
Last updated on 05 Aug 2026 | 01:03 AM (IST)
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Monast LC Syrup image
Monast LC Syrup image

Product introduction

Monast LC Syrup can be taken with or without food. Take it in a dose and duration as advised by the doctor. The dose you are given will depend on the severity of your condition and how you respond to the medicine. Keep taking the medicine for as long as your doctor recommends. If you stop treatment too early, your symptoms may come back, and your condition may worsen.


The most common side effects are nausea, diarrhea, vomiting, dry mouth, headache, skin rash, flu-like symptoms, and fatigue. Most of these are temporary and usually resolve with time. Contact your doctor straight away if you are at all concerned about any of these side effects.


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. Avoid drinking alcohol while taking this medicine, as it can worsen your sleepiness. Let your doctor also know about all other medicines you are taking, as some may affect, or be affected by, this medicine.

Uses of Monast LC Syrup

  • Allergic rhinitis

Benefits of Monast LC Syrup

Allergic rhinitis
Monast LC Syrup is used to manage allergic rhinitis, which causes symptoms such as sneezing, runny or blocked nose, and itchy or watery eyes. It works by blocking allergic reactions and reducing inflammation in the airways. This helps relieve symptoms and makes breathing easier. Use it regularly to help prevent symptoms and reduce flare-ups.

Side effects of Monast LC 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 Monast LC
  • Diarrhea
  • Dryness in mouth
  • Fatigue
  • Headache
  • Skin rash
  • Sleepiness
  • Nausea
  • Vomiting
  • Upper respiratory tract infection
  • Sore throat
  • Fever
  • Abdominal pain
  • Increased liver enzymes

How to use Monast LC 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. Monast LC Syrup may be taken with or without food.

How Monast LC Syrup works

Monast LC Syrup is a combination of two medicines: Levocetirizine and Montelukast, which relieve sneezing and a runny nose due to allergies. Levocetirizine is an antihistamine that blocks a chemical messenger (histamine) responsible for runny nose, watery eyes, and sneezing. Montelukast is a leukotriene antagonist. It works by blocking another chemical messenger (leukotriene). This reduces inflammation (swelling) in the airways and nose, and improves symptoms.

Quick tips

  • Take Monast LC Syrup regularly as prescribed, often in the evening, to help effectively control allergy symptoms.
  • Monast LC Syrup may cause dizziness or drowsiness, so avoid driving or operating machinery until you know how it affects you.
  • Avoid alcohol while taking Monast LC Syrup, as it may increase sleepiness and dizziness.
  • Dry mouth may occur as a side effect. Drinking water frequently, maintaining oral hygiene, or using sugar-free gum or candy may help.
  • Stop taking Monast LC Syrup at least three days before allergy skin testing, as it may affect the results.
  • Inform your doctor if you have a history of kidney disease before taking Monast LC Syrup.
  • Watch for unusual mood changes, irritability, or sleep disturbances, and inform your doctor if they occur.
  • Avoid known allergy triggers such as dust, pollen, or smoke to improve symptom control while taking Monast LC Syrup.
  • Consult your doctor if symptoms persist despite regular use of Monast LC Syrup.

Safety advice

Alcohol

Alcohol

CAUTION
Alcohol should be used with caution while taking Monast LC Syrup.
Pregnancy

Pregnancy

CONSULT YOUR DOCTOR
The safety of Monast LC Syrup during pregnancy has not been established. There are no adequate and well-controlled studies in pregnant women, and animal data on reproductive toxicity are insufficient. Your doctor will weigh the benefits and any potential risks before prescribing.
Breast feeding

Breast feeding

CONSULT YOUR DOCTOR
Monast LC Syrup may be unsafe to use during breastfeeding. Limited human data suggests that the drug may pass into the breastmilk and harm the baby. It should be used only if the expected benefit outweighs the potential risk. Please consult your doctor.
Driving

Driving

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

Kidney

CAUTION
Monast LC Syrup should be used with caution in patients with kidney disease. Dose adjustment may be needed.
Use of Monast LC Syrup is not recommended in patients with severe kidney disease.
Liver

Liver

CAUTION
Monast LC Syrup should be used with caution in patients with liver disease. Dose adjustment may be needed.
Limited information is available on the use of Monast LC Syrup in these patients. No dose adjustment is recommended in patients with mild to moderate liver disease.
All

Frequently asked questions

Some people may feel drowsy or sleepy when taking Monast LC Syrup, though this is uncommon. If you notice that you feel unusually tired or sleepy after taking it, be cautious when driving or operating machinery. If drowsiness becomes bothersome or affects your daily activities, talk to your doctor.
You should not stop taking Monast LC Syrup simply because your allergy symptoms have improved. Your doctor should determine the course and duration of the medicine based on your condition. Abruptly stopping before the recommended duration may not fully control your symptoms, so always talk to your doctor before discontinuing.
Dry mouth is a possible side effect of Monast LC Syrup. Drinking water at regular intervals, using sugar-free candies or chewing gum may help. If dry mouth persists or becomes uncomfortable, talk to your doctor about ways to manage it.
Alcohol can increase drowsiness and may worsen side effects such as sleepiness or light-headedness. While there is no direct contraindication, combining alcohol with Monast LC Syrup may make you feel more sedated or less alert. It is generally best to avoid or limit alcohol while taking this medicine and discuss any concerns with your doctor.
Taking more than the recommended dose of Monast LC Syrup may increase the chance of side effects. Always follow the dose and frequency prescribed by your doctor. If you feel your symptoms are not well controlled, talk to your doctor rather than increasing the dose on your own.
Monast LC Syrup is a combination tablet that helps relieve allergy and respiratory discomfort symptoms. It contains medicines that block certain chemicals in the body that trigger allergic reactions and help reduce symptoms such as sneezing, a runny nose, throat irritation, and cough. By targeting the underlying pathways of allergy and cough reflex, it supports symptom relief when used as directed by your doctor.
Most people do not experience mood or behavior changes with Monast LC Syrup. However, if you notice unusual mood swings, increased irritability, agitation, or behavior that seems out of character after starting the medicine, talk to your doctor. These changes are uncommon and may need evaluation to rule out other causes.
Monast LC Syrup is intended to relieve allergy-related symptoms such as sneezing, runny nose, and throat irritation, which can be associated with nasal discomfort. It may help improve overall symptoms, but if your blocked nose is due to severe congestion, other targeted treatments (such as a nasal decongestant recommended by your doctor) may provide more direct relief. Consult your doctor for the most appropriate treatment for nasal blockage.
The number of Monast LC Syrup tablets you can take in a day depends on your age, symptoms, and your doctor’s prescription. Do not exceed the dose and frequency recommended by your doctor. If you are unsure how many tablets to take or if your symptoms are changing, talk to your doctor for specific instructions.
A cough from a bacterial infection is often accompanied by other signs, such as thick yellow or green sputum, fever, or worsening symptoms over several days rather than improvement. However, distinguishing a bacterial cough from a viral one can be difficult without clinical evaluation. If your cough persists, worsens, or is accompanied by high fever and difficulty breathing, talk to your doctor for proper evaluation and tests.
There is no direct evidence that Monast LC Syrup negatively affects kidney function in people with normal kidney health when taken at prescribed doses. However, if you have existing kidney problems, are taking other medicines, or have concerns about kidney health, it’s important to inform your doctor. They can determine whether any monitoring or dose adjustments are needed.
Monast LC Syrup should be used during pregnancy only if the expected benefit outweighs the potential risk to the developing baby. The safety can vary depending on the trimester and the reason for use. Always discuss your symptoms, medical history, and stage of pregnancy with your doctor before starting Monast LC Syrup.
Yes, in rare cases, Monast LC Syrup may cause an allergic skin reaction. Symptoms can include itching, redness, or raised rashes. Even though the medicine is used to treat allergy symptoms, some individuals may be sensitive to its ingredients. If you notice a new rash, swelling of the face, or any unusual skin reaction after taking Monast LC Syrup, stop using it and seek medical advice immediately.
Monast LC Syrup can be used in both children and older adults, but only when a doctor advises it. In children, the dose needs to be carefully adjusted based on age and body weight, as giving too much can cause side effects. In older adults, the medicine may be started at a lower dose and monitored closely to ensure it is safe and working properly.

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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: Emcure Pharmaceuticals Ltd
Address: 255/2, Hinjawadi, Pune - 411057, India / Godown A, Gat No. 408 and 410, Vill: Urse, Tal: Maval, Pune-410 506, Maharashtra, India.

Vendor Details

Country of origin: India
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