Telfast (Fexofenadine HCl) is an antihistamine prescribed to alleviate the symptoms of allergic rhinitis or urticaria.


Fexofenadine Hydrochloride





60 mg, 120 mg, 180 mg

Turkey, UK, NZ



Originally developed as an antihistamine, Telfast quickly established itself as a known pharmaceutical name. The story of Telfast, from its inception to its integration into therapeutic practices, is a fascinating tale of innovation and patient-centric care. While Telfast is widely recognized for its effectiveness in treating reactions, several other competing brands and alternatives are also on the market. These alternatives, such as Allegra, Fastofen, and Tilfur, each offer their formulations or methods of delivery.


Telfast is an antihistamine medication that is used to relieve the symptoms of hay fever (seasonal allergic rhinitis) and hives (chronic idiopathic urticaria) 12It is also effective in treating specific allergic reactions like a runny nose and hives 3Telfast is known to provide relief within an hour after taking it, and its effects typically last for up to 24 hours 34.

3Telfast : Uses, Dosage, Side Effects, FAQ - MedicinesFAQ 4Telfast : Uses, Dosage, Side Effects, FAQ | MedicinesFAQ 1Telfast Dosage & Drug Information | MIMS Philippines 2How To Relieve Your Allergies | Telfast AU

How it Works

Telfast's main strength lies in how it works. It acts as an opponent to the H1 receptor, which essentially means it stops histamine, a substance in our bodies that causes allergic symptoms, from doing its thing. This way, it acts as a shield. Prevents histamine from triggering allergic reactions. When people take Telfast, they usually notice an improvement in their symptoms within 1 to 2 hours, with the maximum effect kicking in around 6 hours later.

Side Effects

While Telfast brings relief to many, understanding the risks associated with its use is essential. Like medications, it can have both common and rare side effects. Differentiating between these categories is crucial for managing symptoms and making decisions about ongoing usage.

Common Side Effects

The field of medicine has recognized side effects that are commonly associated with Telfast. These may include headaches, dizziness, sleep disruptions, and feelings of nausea. While these symptoms can be concerning, steps can be taken to address and potentially reduce their impact. Staying hydrated, getting rest, and adjusting your diet often prove helpful. However, if these side effects continue or worsen, it is advisable to seek medical assistance.

Off-label Use

According to MedicinesFAQ, Telfast is used for the relief of symptoms associated with seasonal and perennial allergic rhinitis and chronic idiopathic urticaria 123It is also effective in treating specific allergic reactions like a runny nose and hives 1. While these are the approved uses for Telfast, there have been instances where Telfast has been prescribed for conditions other than its main approved uses. For example, some doctors may prescribe it for allergic rhinitis. This off-label use usually comes from evidence based on experience or smaller studies, which highlight the drug’s versatility and potential for therapeutic applications 14.

1Telfast : Uses, Dosage, Side Effects, FAQ - MedicinesFAQ 4: Off-Label Use of Drugs: What You Need to Know | FDA 2: Telfast Dosage & Drug Information | MIMS Philippines 3: How To Relieve Your Allergies | Telfast AU

Dosage and Administration

To ensure you get the results, following the recommended dosages is essential. For adults and teenagers over 12 years, the usual daily dose is between 120mg and 180mg. However, these doses can vary depending on requirements, health conditions, or specific groups like older adults or people with kidney problems. Taking Telfast orally before a meal is generally advised as it helps with absorption and fast action. In some cases, doctors may adjust the dose to ensure personalized treatment is provided.


The effectiveness lies in its unique formulation. The active component, Fexofenadine, is responsible for its antihistamine effects. Each ingredient has a role and works together to enhance its therapeutic benefits. In addition to Fexofenadine, the medication includes inactive ingredients commonly used as fillers and stabilizers. It's essential for patients with allergies to be aware of these ingredients to ensure their safety and well-being.


To ensure that Telfast remains effective, following the recommended storage guidelines is essential. This medication is best stored in dry areas away from direct sunlight and moisture. It should be kept at room temperature between 20°C to 25°C. Like any medicine, Telfast may lose its effectiveness after a certain period, so it's advisable to check the tablets for any changes in color or shape before consuming them to ensure optimal efficacy.


Understanding the landscape of drug interactions is crucial for maximizing the benefits of Telfast while minimizing risks. It's important to note that specific antifungal agents, antibiotics, and antacid medications can interfere with the effectiveness of Telfast. Additionally, consuming grapefruit juice may reduce the efficacy of Telfast. Potentially amplify its side effects. It's also worth mentioning that combining Telfast with alcohol or sedatives can worsen drowsiness, which is a possible side effect.


In the treatment field, it's important to be aware and prepared. Telfast is effective. It's essential to be cautious in certain situations. Specifically, people with kidney problems or a history of allergic reactions to antihistamines should be careful when using it. Moreover, individuals prone to dizziness or involved in tasks that require attention should be aware that increased risks might be affected.


There are some situations where it's essential to avoid taking Telfast. If someone has experienced allergic reactions to any of the ingredients in Telfast, they should not use it. In some cases, doctors often recommend using alternatives, like cetirizine or loratadine, to prevent potential problems.

Careful Administration

In health conditions like kidney problems or liver diseases, it is essential to be careful when taking Telfast. You may need to adjust your dosage and have frequent checkups. These checkups will include tests to assess your kidney function and liver enzymes to ensure you take the medication safely and effectively.

Important Precautions

To fully reap the benefits of Telfast, it is essential to take precautions. Some general safety guidelines include refraining from consuming alcohol while undergoing treatment and avoiding activities that demand mental alertness, such as driving, if you experience drowsiness.

Administration to the Elderly

Elderly individuals may require adjustments to their medication dosages due to changes in their body functions. It's essential to consider factors such as decreased kidney function and increased vulnerability to side effects like dizziness. This calls for monitoring and potential reduction of the medication dosage when necessary.

Administration to Pregnant Women and Nursing Mothers

Embarking on the journey of motherhood while taking Telfast requires consideration. Although Telfast has a good safety record during pregnancy, it is essential to carefully evaluate the benefits of its treatment against any potential risks to the baby. Breastfeeding mothers should also proceed cautiously as there is a possibility that the drug may be passed into breast milk. It is crucial to consult with an obstetrician or pediatrician in both situations.

Administration to Children

Regarding children, it's essential to have dosage guidelines that consider their pharmacokinetic profiles. While Telfast is approved for use in children, it's crucial to ensure safety by using dosages, often based on weight. For kids, pediatric formulations such as oral suspensions might be more suitable.


Exceeding the recommended doses can lead to consequences. Taking too much may result in feelings of dizziness, heart palpitations, or fatigue. Addressing the situation through actions such as gastric lavage or providing symptomatic treatment is crucial. While long-term complications are uncommon, with intervention, it is important to continue medical monitoring after an overdose to ensure a complete and optimal recovery.

Handling Precautions

It is crucial to handle it correctly for it to work effectively. It should be stored in a cool place, out of reach of children. When it expires, it is essential to dispose of it, preferably by returning it to a pharmacy. This ensures both safety and environmental responsibility.

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