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L-Siacet 5mg Tablet

Levocetirizine (5mg)

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L-Siacet 5mg Tablet belongs to a group of medicines called antihistamines. It is used to treat various allergic conditions such as hay fever, conjunctivitis, some skin reactions such as eczema, hives, and reactions to bites and stings. It also relieves watery eyes, runny nose, sneezing, and itching.

Written By Dr. Syeda Aafia, MBA, BDS,
Reviewed By Dr. Rajeev Sharma, MBA, MBBS,
Last updated on 19 Jan 2026 | 08:53 PM (IST)

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L-Siacet 5mg Tablet

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Levocetirizine (5mg)

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General Information

Contains

Levocetirizine (5mg)

Marketer

Willow Pharmaceuticals Pvt Ltd

Storage

Store below 30°C

The content is shown in English

Product introduction

L-Siacet 5mg Tablet can be taken with or without food. The dose required by you may vary depending on what you are taking it for. This medicine is usually taken in the evening, but follow the advice of your doctor on how to take it. You may need this medicine only on days you have symptoms, but if you are taking it to prevent the symptoms then you should take it regularly. If you miss doses or stop taking it earlier than advised, your symptoms may come back.

Common side effects include somnolence (sleepiness), dry mouth, fatigue, fever, cough, nasopharyngitis, and nosebleed. These are usually mild and go away after a couple of days as your body adjusts to it. Consult your doctor if any of the side effects persist or worry you.

Before taking it, tell your doctor if you have any kidney problems or epilepsy (seizures). Your dose may need to be modified or this medicine may not suit you. Some other medicines can interact with this medicine so let your healthcare team know what else you are taking. You should also talk to your doctor before using this medicine if you are pregnant or breastfeeding, although it is not thought to be harmful.

Uses of L-Siacet Tablet

Treatment of Allergic conditions

Benefits of L-Siacet Tablet

Treatment of Allergic conditions
L-Siacet 5mg Tablet provides relief from symptoms such as blocked or runny nose, sneezing, and itchy or watery eyes. This will make it easier for you to go about your daily activities. It can also give relief from allergic reactions after insect bites and symptoms of hives and eczema such as rash, swelling, itching, and irritation. This will improve the appearance of your skin and you may find that your mood and self-confidence improve as well. It rarely has any serious side effects and you may only need to take it on days you have symptoms. Moreover, L-Siacet 5mg Tablet may make you feel less sleepy as compared to other antihistamine medicines. If you are taking it to prevent getting symptoms you should use it regularly to get the most benefit.

Side effects of L-Siacet Tablet

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 L-Siacet

Nasopharyngitis (inflammation of the throat and nasal passages)
Sore throat
Fever
Cough
Nosebleeds
Fatigue
Dryness in mouth
Sleepiness

How to use L-Siacet Tablet

Take this medicine in the dose and duration as advised by your doctor. Swallow it as a whole. Do not chew, crush or break it. L-Siacet 5mg Tablet may be taken with or without food.

How L-Siacet Tablet works

L-Siacet 5mg Tablet is an antihistaminic medication. It treats allergy symptoms such as itching, swelling, and rashes by blocking the effects of a chemical messenger (histamine) in the body.

All substitutes for L-Siacet 5mg Tablet

For information purposes only. Consult a doctor before taking any medicine.

Quick tips

Your doctor has prescribed L-Siacet 5mg Tablet to help relieve allergy symptoms such as itching, swelling, and rashes.
Compared to other similar medications, it is much less likely to make you feel sleepy.
Be cautious while driving or doing anything that requires concentration, as it can cause dizziness and sleepiness.
Do not drink alcohol while taking this medication as it may cause increased sleepiness.
Stop taking L-Siacet 5mg Tablet at least three days before taking an allergy test as it can affect the test results.

Safety advice

Alcohol

UNSAFE

Do not drink alcohol while you are taking this medicine. L-Siacet 5mg Tablet may cause excessive drowsiness when taken with alcohol. Avoid concurrent use of alcohol or other central nervous system depressants with this medicine.

Pregnancy

SAFE IF PRESCRIBED

L-Siacet 5mg Tablet is generally considered safe to use during pregnancy. Animal studies do not indicate harmful effects. However, there are limited human studies.

Breast feeding

CAUTION

L-Siacet 5mg Tablet 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

UNSAFE

L-Siacet 5mg Tablet may decrease alertness, affect your vision, or make you feel sleepy and dizzy. Do not drive if these symptoms occur.

Kidney

CAUTION

L-Siacet 5mg Tablet should be used with caution in patients with kidney disease. Dose adjustment may be needed.

Liver

SAFE IF PRESCRIBED

L-Siacet 5mg Tablet is safe to use in patients with liver disease. No dose adjustment is recommended.

Interaction with drugs

Taking L-Siacet with any of the following medicines can modify the effect of either of them and cause some undesirable side effects

Moderate

Mirtazapine (Oral Route)

Do not drive or do anything requiring concentration or alertness until you know how the medicines affect you.

Moderate

Thalidomide (Oral Route)

If concurrent use is essential, watch out for symptoms of Thalidomide side effects such as drowsiness, excessive sedation, tiredness, dizziness or slurred speech and consult your doctor if you experience them. It is advised to avoid driving or undertaking other tasks requiring skill and alertness.

Moderate

Tranylcypromine (Oral Route)

Do not take Tranylcypromine with Levocetirizine. If concurrent use is essential, talk to your doctor.

Moderate

Dalteparin (Injection Route)

Your doctor may frequently monitor your blood clotting time. Levocetirizine may reduce the efficacy of Dalteparin.

Mild

Mefloquine (Oral Route)

Talk to your doctor if you experience palpitations, high/low blood pressure, increased sweating, etc.

Frequently asked questions

Is L-Siacet 5mg Tablet a steroid? What is it used for?

No, L-Siacet 5mg Tablet is not a steroid. It is an anti-allergic medication that is used to relieve the symptoms of allergy. It relieves a runny nose, sneezing, redness, itching, and watering of the eyes caused by hay fever or seasonal allergies. It also relieves similar symptoms caused by allergies to substances, such as dust mites, animal dander, and mold. Additionally, it helps treat symptoms of hives, including itching and rash.

Does L-Siacet 5mg Tablet make you tired and drowsy?

Yes, L-Siacet 5mg Tablet can make you feel tired, sleepy, and weak. If you have these symptoms, avoid driving or operating heavy machinery. Consult your doctor if not sure.

How long does it take for L-Siacet 5mg Tablet to work?

L-Siacet 5mg Tablet starts working and showing improvement within an hour of taking it. However, it may take a little longer to notice the full benefits.

Can I take L-Siacet 5mg Tablet and fexofenadine together?

Sometimes the doctor may advise you to take two different antihistamines together if you are being treated for a severe itchy rash. If you are taking L-Siacet 5mg Tablet during the daytime, your doctor may prescribe another antihistamine for the night, which causes sleepiness, especially if the itch makes it difficult for you to sleep.

Is it safe to take L-Siacet 5mg Tablet for a long time?

L-Siacet 5mg Tablet is safe if used as prescribed by your doctor. Moreover, it is unlikely to harm you if you take it for a long time. But, it is best to take L-Siacet 5mg Tablet for only as long as you need it.

For how long should I continue L-Siacet 5mg Tablet?

The duration for which the medicine needs to be taken depends on the problem being treated. For instance, if you are taking it for an insect bite, you may need it for a day or two. If you are taking it to prevent symptoms of chronic allergic rhinitis (inflammation of the nose) or chronic urticaria, you may need to take L-Siacet 5mg Tablet for a longer time. Talk to your doctor if you are unsure about the duration of using L-Siacet 5mg Tablet.

Fact Box

Chemical Class

Diphenylmethanes

Habit Forming

Therapeutic Class

RESPIRATORY

Action Class

Second-Generation H1 Antihistamines

Related lab tests

Absolute Eosinophil Count

Peripheral Smear Examination

Total IgE

References

Briggs GG, Freeman RK, editors. A Reference Guide to Fetal and Neonatal Risk: Drugs in Pregnancy and Lactation. 10th ed. Philadelphia, PA: Wolters Kluwer Health; 2015. p. 790.
Levocitirizine [EMC SmPC]. Slough, Berkshire: UCB Pharma Limited; 2019. [Accessed 01 Apr. 2019] (online) Available from:
Levocitrizine [Product Information]. Nashville, TN: Westminster Pharmaceuticals, LLC; 2025. [Accessed 19 Jan. 2026] (online) Available from:
Levocetirizine Dihydrochloride [Summary of Product Characteristics]. Lagos, Nigeria: Afrab Chem Limited. [Accessed 19 Jan. 2026] (online) Available from:
Central Drugs Standard Control Organisation (CDSCO). [Accessed 01 Apr. 2019] (online) Available from:
Levocetirizine dihydrochloride [Prescribing Information]. Smyrna, GA: UCB, Inc.; 2008. [Accessed 20 Feb. 2024] (online) Available from:

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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: Willow Pharmaceuticals Pvt Ltd
Address: sco-299, 2nd floor, sector 20, panchkula, haryana, 134120, india

Vendor Details

Country of origin: India

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L-Siacet 5mg Tablet

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