Loratadine is an anti-allergy medicine, available as a tablet or syrup, used to treat allergic conjunctivitis when it is accompanied by systemic symptoms.
| Drug class | Antihistamine (Oral) |
|---|---|
| Type | Single |
| Forms | Tablet / Syrup |
| Common strength | 10 mg |
| Common Indian brands | Lorfast, Alaspan |
| Prescription status | Prescription / OTC |
What Loratadine is used for
Loratadine is an anti-allergy medicine that helps relieve symptoms associated with certain eye conditions. Specifically, it is prescribed for:
- Allergic conjunctivitis with systemic symptoms
Allergic conjunctivitis is a common condition where the eyes become red, itchy, and watery due to an allergic reaction. When these eye symptoms are accompanied by other body-wide (systemic) allergy symptoms, Loratadine can be an effective treatment.
How it works
Loratadine belongs to a category of medicines called antihistamines. It is a ‘second-generation oral antihistamine’. When your body encounters an allergen (something you are allergic to, like pollen or dust mites), it releases a substance called histamine. Histamine is responsible for many allergy symptoms, including the itching, redness, and swelling you experience. Loratadine works by blocking the action of histamine, thereby reducing these allergic reactions throughout your body, including those affecting your eyes.
How it’s used
Loratadine is available as a tablet or syrup and is taken orally (by mouth). The typical dosing for adults is 10 mg once a day. It is important to take this medicine exactly as prescribed by your ophthalmologist or doctor. You can take it with or without food, but try to take it at the same time each day to help you remember. Do not exceed the recommended dose or take it for longer than advised by your doctor.
Always follow your ophthalmologist’s exact instructions.
Brands available in India
- Lorfast
- Alaspan
Brand availability and pricing vary; confirm with your pharmacist.
Good to know
Prescription eye medicine — use only as directed by a qualified ophthalmologist. This page is for general education and is not a substitute for professional medical advice, diagnosis or a prescription. Do not self-medicate or reuse an old prescription.
Precautions & side effects
While Loratadine is generally well-tolerated, there are a few important points to keep in mind:
- Sedation: Loratadine is known for causing low sedation, meaning it is less likely to make you feel drowsy compared to some older antihistamines. However, individual responses can vary. If you experience any drowsiness, it’s best to avoid driving or operating heavy machinery.
- Prescription Medicine: This is a prescription eye medicine. It should only be used as directed by a qualified ophthalmologist.
- General Warning: This page provides general education and is not a substitute for professional medical advice, diagnosis, or a prescription. Do not self-medicate or reuse an old prescription. Always consult your doctor for proper guidance.
Understanding Allergic Conjunctivitis and Systemic Symptoms
Allergic conjunctivitis is a common eye condition that occurs when your eyes react to allergens in the environment. Common allergens include pollen from trees, grasses, and weeds, dust mites, pet dander, and mould spores. When these allergens come into contact with your eyes, your body’s immune system overreacts, releasing chemicals like histamine. This leads to typical symptoms such as:
- Itchy eyes
- Redness in the white of the eye or inner eyelid
- Watery discharge from the eyes
- Swelling of the eyelids
- A gritty or burning sensation in the eyes
In some cases, these eye symptoms are accompanied by other allergy symptoms that affect the rest of your body. These are called ‘systemic symptoms’ and can include a runny nose, sneezing, nasal congestion, or an itchy throat. When allergic conjunctivitis presents with these systemic symptoms, medicines like Loratadine, which work throughout the body, can be very effective in providing relief.
It’s important to identify and, if possible, avoid the allergens that trigger your symptoms. Keeping your home clean, using air purifiers, and avoiding outdoor activities during high pollen counts can help manage your condition. Always consult your ophthalmologist to get an accurate diagnosis and a personalised treatment plan.
General Advice for Taking Oral Medicines for Eye Conditions
While Loratadine is an oral medicine (tablet or syrup) and not an eye drop, proper adherence to your doctor’s instructions is crucial for its effectiveness. Here are some general tips:
- Follow Dosing Instructions: Always take the exact dose prescribed by your ophthalmologist. Do not take more or less medicine than advised.
- Consistency is Key: Try to take your medicine at the same time each day. This helps maintain a steady level of the medicine in your body and improves its effectiveness.
- With or Without Food: Unless specifically instructed otherwise by your doctor, Loratadine can generally be taken with or without food.
- Do Not Stop Abruptly: Do not stop taking your medicine without consulting your doctor, even if your symptoms improve. Your doctor will advise you on the appropriate duration of treatment.
- Storage: Store your tablets or syrup in a cool, dry place, away from direct sunlight and moisture. Keep all medicines out of reach of children.
- Check Expiry Date: Always check the expiry date on the packaging before taking any medicine. Do not use expired medication.
If you miss a dose, take it as soon as you remember. However, if it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not double the dose to make up for a missed one.
When to Seek Medical Help
While Loratadine is generally safe and effective for allergic conjunctivitis with systemic symptoms, it’s important to know when to seek further medical attention. Always consult your ophthalmologist if:
- Your eye symptoms worsen or do not improve after a few days of taking the medicine as prescribed.
- You experience severe eye pain, sudden vision changes, or extreme sensitivity to light.
- Your eyes become very red, swollen, or you notice any discharge that is thick or yellowish/greenish, as this could indicate an infection.
- You develop new or unusual symptoms after starting the medication.
- You have any concerns about the medicine or its side effects.
Regular follow-up appointments with your ophthalmologist are important to monitor your condition and adjust your treatment plan if necessary. Remember, this information is for general education. Always rely on the advice and prescription of a qualified medical professional for your specific health needs.
Frequently asked questions
What is Loratadine used for?
Loratadine is an anti-allergy medicine used to treat allergic conjunctivitis when it is accompanied by systemic (body-wide) allergy symptoms.
How does Loratadine work?
Loratadine is a second-generation oral antihistamine. It works by blocking the action of histamine, a substance released by your body during an allergic reaction, thereby reducing allergy symptoms including those affecting your eyes.
What are the common Indian brands of Loratadine?
In India, Loratadine is commonly available under brand names such as Lorfast and Alaspan.
How should I use Loratadine?
Loratadine is taken orally, either as a tablet or syrup. The typical dose is 10 mg once a day. Always follow your ophthalmologist's instructions precisely regarding the dose and duration of treatment.
Do I need a prescription for Loratadine?
Loratadine can be available as a prescription medicine or over-the-counter (OTC). However, for eye conditions, it is considered a prescription eye medicine and should only be used as directed by a qualified ophthalmologist.
What precautions should I take while using Loratadine?
Loratadine is known for causing low sedation, meaning it is less likely to make you drowsy. However, individual responses can vary. Always use this medicine only as directed by your ophthalmologist and do not self-medicate or reuse old prescriptions.
References
- Loratadine – StatPearls – NCBI Bookshelf
- About loratadine – NHS
- Oral antihistamines for seasonal allergic conjunctivitis – PMC – NIH
- Eye Allergies – American Academy of Ophthalmology
- Eye Diseases – MedlinePlus
Medically reviewed by Dr. C Jagadesh Reddy, Chief Surgeon: Cornea, Cataract and Refractive Surgery — last reviewed 2026-07-28.
This page is for general education only and is not a substitute for professional medical advice, diagnosis or treatment. Never self-medicate or reuse an old prescription. Always consult a qualified ophthalmologist before starting, changing or stopping any eye medicine.