Zylofen: The Ultimate Guide to Managing Asthma and Allergies

Zylofen is a widely used medication for managing asthma and allergic conditions. This drug combines the active ingredient Ketotifen fumarate with various excipients to offer relief from a range of respiratory and allergic symptoms. In this comprehensive guide, we will delve into the key aspects of Zylofen, including its composition, pharmacological actions, uses, and more.

Composition of Zylofen

Zylofen is available in two primary forms: tablets and syrup. Each form contains different concentrations of the active ingredient, Ketotifen fumarate.

Zylofen Tablet

• Active Ingredient: Ketotifen fumarate 1.38 mg (equivalent to ketotifen base 1 mg)
• Excipients: Microcrystalline cellulose, Croscarmellose sodium, Magnesium stearate

Zylofen Syrup

• Active Ingredient: Ketotifen fumarate 27.6 mg per 100 ml (equivalent to ketotifen base 20 mg)
• Excipients: Sorbitol solution 70%, saccharin sodium, methyl paraben, propyl paraben, citric acid monohydrate, sodium dibasic phosphate (anhydrous)

Pharmacological Action of Zylofen

Ketotifen is a potent anti-asthmatic and anti-allergic agent. It operates through several mechanisms to alleviate symptoms of asthma and allergic reactions:

• Inhibition of Allergic Mediators: Ketotifen inhibits the release of histamine and leukotrienes, which are critical in the inflammatory response.
• Eosinophil Priming Suppression: It suppresses the priming of eosinophils, reducing their influx into inflammatory sites.
• Airway Hyperreactivity: Ketotifen prevents airway hyperreactivity induced by platelet-activating factor (PAF) or sympathomimetics.
• Histamine H1 Receptor Blockade: The drug has non-competitive histamine (H1) blocking properties, further contributing to its anti-allergic effects.

Pharmacokinetics

• Absorption: Ketotifen is almost completely absorbed after oral administration, with a bioavailability of approximately 50% due to first-pass metabolism in the liver. Peak plasma concentrations are reached within 2-4 hours.
• Distribution: It is 75% protein-bound.
• Metabolism: The primary metabolite in urine is Ketotifen-N-glucuronide, which is practically inactive.
• Elimination: The elimination of Ketotifen is biphasic, with a short half-life of 3-5 hours and a longer phase of 21 hours. About 1% of the active substance is excreted unchanged, and 60-70% as metabolites in the urine.

Uses and Indications for Zylofen

Zylofen is primarily used for:

• Long-term Prevention of Bronchial Asthma: It is effective in managing all forms of bronchial asthma, including mixed types.
• Allergic Bronchitis: The drug helps in controlling symptoms associated with allergic bronchitis.
• Asthmatic Symptoms Linked to Hay Fever: It alleviates symptoms related to seasonal allergic rhinitis.
• Multisystemic Allergic Disorders: Zylofen is used in treating chronic idiopathic urticaria (e.g., cold urticaria), allergic rhinitis and conjunctivitis, and atopic dermatitis.

Duration of Treatment

• Therapeutic Effect: Zylofen may take several weeks to achieve its full therapeutic effect. It is recommended to continue treatment for a minimum of 2-3 months if satisfactory response is not observed.
• Discontinuation: If discontinuation is necessary, it should be done gradually over 2-4 weeks to avoid a recurrence of symptoms.

Dosage and Administration

For Adults

• Standard Dose: 2 mg daily, typically one tablet twice daily with meals. In cases of sedation, a progressive regimen starting with half a tablet twice daily is advised, increasing to the full dose over five days.
• Increased Dose: May be increased to 4 mg, i.e., two tablets twice daily for a more rapid onset of action.

For Children

• Aged 6 Months to 3 Years: 0.05 mg per kg body weight twice daily.
• Aged Over 3 Years: 5 ml of syrup or 1 tablet twice daily with meals.

Concomitant Therapy and Special Populations

• Bronchodilator Therapy: When used with Zylofen, the frequency of bronchodilator usage may be reduced.
• Elderly: No special measures are required for elderly patients.
• Pregnancy and Lactation: Zylofen should be used during pregnancy only if absolutely necessary. It is not recommended for breastfeeding mothers.

Warnings and Precautions

• Hypersensitivity: Not recommended for individuals with hypersensitivity to Ketotifen or any other components.
• Long-term Use: Caution is advised for long-term use beyond four weeks, especially in chronic idiopathic urticaria cases.
• Seizures: Very rare reports of seizures may occur; caution is needed in patients with a history of epilepsy.

Drug Interactions

• Sedatives and Alcohol: Zylofen may enhance the effects of sedatives, hypnotics, antihistamines, and alcohol.
• Anti-diabetic Agents: Concomitant use with oral antidiabetic agents may result in a reversible fall in thrombocyte count.

This detailed overview of Zylofen provides a comprehensive look at its uses, mechanisms, and guidelines for safe administration. If you need more information or have specific questions, consult a healthcare professional.

Zylofen is produced by Memphis Pharmaceutical Industries, an Egyptian company that distributes and exports its products to various countries in Africa and the Middle East.

FAQs About Zylofen

What are the ingredients of Zylofen tablets and syrup?

Zylofen Tablets:

• Active Ingredient: Ketotifen fumarate 1.38 mg (equivalent to 1 mg of ketotifen base)
• Excipients: Microcrystalline cellulose, Croscarmellose sodium, Magnesium stearate

Zylofen Syrup:

• Active Ingredient: Ketotifen fumarate 27.6 mg per 100 ml (equivalent to 20 mg of ketotifen base)
• Excipients: Sorbitol solution 70%, saccharin sodium, methyl paraben, propyl paraben, citric acid monohydrate, sodium dibasic phosphate (anhydrous)

How does Ketotifen fumarate work in treating asthma and allergies?

Ketotifen fumarate is an antihistamine and anti-inflammatory agent with multiple mechanisms of action:

• Histamine H1 Receptor Blockade: Ketotifen inhibits the action of histamine at H1 receptors, reducing allergic symptoms such as itching, sneezing, and runny nose.
• Inhibition of Allergic Mediators: It prevents the release of histamine and other mediators like leukotrienes, which are involved in allergic responses.
• Suppression of Eosinophil Activation: Ketotifen reduces eosinophil infiltration and activation, which plays a key role in the inflammation associated with asthma and allergies.
• Prevention of Airway Hyperreactivity: The drug prevents excessive bronchoconstriction and inflammation triggered by allergens or other stimuli.

What is the recommended dosage of Zylofen for children?

For Children Aged 6 Months to 3 Years:

• Dosage: 0.05 mg per kg of body weight, administered twice daily.

For Children Aged Over 3 Years:

• Dosage: 5 ml of Zylofen syrup or 1 tablet twice daily with meals.

Can Zylofen be used to abort an asthma attack?

Zylofen is not intended for the immediate relief of acute asthma attacks. It is used for the long-term management and prevention of asthma symptoms and allergic conditions. For acute asthma attacks, quick-relief medications such as inhaled bronchodilators should be used.

What side effects should be monitored while using Zylofen?

Common side effects of Zylofen include:

• Drowsiness or Sedation: This is the most common side effect and can affect daily activities.
• Dry Mouth: Some users may experience a dry mouth.
• Dizziness: Mild dizziness may occur.
• Gastrointestinal Issues: Nausea, vomiting, or abdominal discomfort can be observed.
• Weight Gain: Long-term use might lead to weight gain in some individuals.

Serious side effects are rare but can include:

• Severe Allergic Reactions: Rash, itching, or swelling.
• Seizures: Very rare; seek medical advice if a history of epilepsy exists.
• Blood Disorders: Rare cases of blood disorders such as thrombocytopenia have been reported.

What should be done in case of Zylofen overdose?

In case of an overdose, the following steps should be taken:

• Contact a Medical Professional Immediately: Seek medical attention if an overdose is suspected.
• Symptomatic Treatment: Overdose symptoms may include severe drowsiness or dizziness. Management typically involves symptomatic treatment and supportive care.

Are there any drug interactions with Zylofen?

Drug Interactions:

• Sedatives and Alcohol: Zylofen may enhance the effects of sedatives, hypnotics, antihistamines, and alcohol, leading to increased drowsiness or sedation.
• Anti-diabetic Agents: There is a potential interaction with oral antidiabetic agents, which may result in a reversible fall in thrombocyte count.
• Other Medications: Always inform your healthcare provider of all medications you are taking to avoid potential interactions.

What precautions should be taken when using Zylofen?

Precautions:

• Avoid Alcohol: Since Zylofen can cause drowsiness, it is advisable to avoid alcohol.
• Driving and Operating Machinery: Due to its sedative effects, caution is advised when driving or operating machinery.
• Long-term Use: For conditions requiring long-term use, monitor for any adverse effects and consult your healthcare provider regularly.
• Pre-existing Conditions: Use with caution in individuals with a history of seizures or those who are pregnant or breastfeeding.

Is Zylofen safe during pregnancy?

Pregnancy: Zylofen should only be used during pregnancy if absolutely necessary and under the guidance of a healthcare provider. The safety of Zylofen in pregnancy has not been fully established, so it is essential to weigh the benefits against potential risks.

How should Zylofen be stored?

Storage Instructions:

• Tablets: Store at room temperature, away from direct sunlight and moisture.
• Syrup: Store in a cool, dry place, and keep it tightly closed. The syrup should be kept out of reach of children and used within the expiry date provided on the bottle.

For any additional questions or concerns regarding Zylofen, consult your healthcare provider for personalized advice.