Seretide 25/50 is an inhalation spray medication formulated as an aerosol in an inhaler. It contains salmeterol and fluticasone and is used to treat asthma and chronic obstructive pulmonary disease (COPD).
1. What Are the Effects of Seretide 25/50?
Seretide 25/50 contains salmeterol and fluticasone propionate, which have different mechanisms of action. Specifically:
- Salmeterol effectively protects against bronchoconstriction induced by histamine, providing long-lasting bronchodilation.
- Inhaled fluticasone propionate has anti-inflammatory activity, reducing symptoms and exacerbations of asthma without the adverse effects associated with systemic corticosteroids.
Indications for Seretide 25/50 Inhalation Spray
- Seretide 25/50 is indicated for the following conditions:
- Asthma Treatment: Regular treatment of asthma (reversible airway obstruction), including asthma in adults and children aged 4 years and older.
2. Instructions for Using Seretide 25/50
Patients must use the medication regularly, even when asymptomatic, to ensure optimal treatment efficacy. Regular follow-up with a physician is necessary to determine the optimal dosage of Seretide.
2.1. How to Use Seretide 25/50
Seretide 25/50 is used via oral inhalation.
Instructions for Using the Seretide 25/50 Inhaler
Checking the Inhaler:
- Before the first use, remove the mouthpiece cap (by gently squeezing its sides).
- Shake the inhaler well.
- Hold the inhaler between fingers and spray into the air until the dose counter displays "120" to ensure it functions properly.
- Always shake the inhaler before use.
- If the inhaler has not been used for a week or longer, remove the cap, shake well, and spray once into the air.
- Each activation reduces the dose counter by one. Dropping the inhaler may also affect the counter.
Using the Inhaler: Follow these steps:
- Remove the mouthpiece cap (by gently squeezing its sides).
- Inspect the inside and outside of the inhaler, including the mouthpiece, ensuring all parts are intact.
- Shake the inhaler well to mix the ingredients evenly.
- Hold the inhaler upright between your fingers with your thumb at the base, below the mouthpiece.
- Exhale fully until comfortable, then place the mouthpiece between your teeth, sealing your lips around it (do not bite).
- Start inhaling slowly, pressing down on the inhaler to release the medication while continuing to inhale deeply and steadily.
- Hold your breath, remove the inhaler from your mouth, release your finger from the canister, and continue holding your breath as long as comfortably possible.
- If a second dose is needed, keep the inhaler upright, wait about 30 seconds, and repeat steps 3-7.
- Rinse your mouth with clean water and spit it out.
- Replace the mouthpiece cap securely. If it does not fit, turn it in the opposite direction and try again without using excessive force.
Important Notes:
- Do not rush steps 5-7. Inhale slowly before activating the inhaler.
- Practice in front of a mirror for the first few times. If mist escapes from the top of the inhaler or the sides of your mouth, start over from step 2.
- When the dose counter shows "020," consider replacing the inhaler. When it reaches "000," replace it immediately.
2.2 Dosage of Seretide 25/50 Inhalation Spray
Asthma
- The lowest effective dose should be used to maintain symptom control.
- If symptom control is achieved with two doses per day, the dose may be reduced to once daily.
- The fluticasone propionate concentration should be adjusted based on disease progression.
For patients whose asthma is not adequately controlled with inhaled corticosteroids alone, Seretide can be used as a substitute, providing similar corticosteroid doses while improving asthma control. Patients already well-controlled with inhaled corticosteroids alone may benefit from lower corticosteroid doses with Seretide while maintaining asthma control.
For Patients Aged 12 and Older:
- Recommended dose: 2 puffs of 25mcg salmeterol + 250mcg fluticasone propionate, twice daily.
- Maximum recommended dose: 50/500 mcg, twice daily.
COPD
- Recommended dose for adults: 2 puffs of 25mcg salmeterol + 250mcg fluticasone propionate, twice daily.
- With 50/500 mcg, twice daily, Seretide has been shown to reduce all-cause mortality.
Special Populations
- No dosage adjustment is needed for elderly patients or those with hepatic or renal impairment.
Overdose:
• Symptoms include tremors, headaches, systolic hypertension, tachycardia, hypokalemia, and adrenal suppression.
• Treatment involves supportive care and appropriate monitoring.
Missed Dose:
• Take the missed dose as soon as possible.
• If it is close to the next dose, skip the missed dose and resume the regular schedule.
3. Side Effects of Seretide 25/50
Common Side Effects:
- Infections & Infestations: Oral, throat, and esophageal Candida infections, pneumonia (in COPD patients), bronchitis.
- Immune System Disorders: Hypersensitivity reactions, anaphylaxis, angioedema, bronchospasm.
- Endocrine Disorders: Cushing’s syndrome, adrenal insufficiency, growth retardation in children, decreased bone mineral density.
- Metabolic Disorders: Hypokalemia, hyperglycemia.
- Psychiatric Disorders: Anxiety, sleep disorders, hyperactivity, depression, agitation.
- Neurological Disorders: Tremors, headaches.
- Ophthalmic Disorders: Glaucoma, cataracts.
- Cardiac Disorders: Palpitations, atrial fibrillation, chest pain, arrhythmias.
- Respiratory Disorders: Hoarseness, sinusitis, throat irritation, bronchospasm.
- Skin & Tissue Disorders: Bruising
- Musculoskeletal Disorders: Joint pain, cramps, fractures, muscle pain.
If side effects occur, discontinue use and consult a doctor immediately.
4. Precautions When Using Seretide 25/50
Contraindications:
- Hypersensitivity to ingredients.
- Initial treatment of asthma or COPD exacerbations.
Precautions When Using Seretide 25/50
- Do not start using the medication in patients experiencing worsening disease or an acute exacerbation of asthma or COPD that poses a life-threatening risk. Seretide 25/50 is not intended for the relief of acute symptoms; instead, a fast-acting, short-duration bronchodilator should be used. Increased use of short-acting bronchodilators to alleviate symptoms may indicate that Seretide is not effectively controlling the disease, and the patient should be reassessed by a physician.
- Seretide 25/50 should not be used more frequently than recommended, at doses higher than prescribed, or in combination with other medications containing long-acting beta-agonists (LABA) to avoid the risk of overdose.
Patients using Seretide 25/50 may develop localized infections in the mouth and throat caused by Candida. If an infection occurs, systemic (oral) or appropriate topical antifungal therapy should be administered, while continuing Seretide treatment. Rinsing the mouth with water and spitting it out after inhalation can reduce the risk of oropharyngeal Candida infections.
The risk of pneumonia increases with Seretide 25/50 use in COPD patients. Physicians should be alert to potential pneumonia symptoms, as they may closely resemble COPD exacerbations.
Adrenal insufficiency may occur in patients transitioning from oral steroids to inhaled fluticasone propionate. Careful management and regular monitoring of adrenal function are required. When initiating fluticasone propionate, oral steroids should be gradually tapered and discontinued.
Inhaled corticosteroids can be systemically absorbed in sensitive individuals. Patients using Seretide 25/50 should be cautious of systemic corticosteroid effects, including steroid-induced Cushing’s syndrome and adrenal suppression. If such effects occur, Seretide dosage should be gradually reduced and alternative asthma treatments considered.
Seretide 25/50 interacts with strong cytochrome P450 3A4 inhibitors, so caution is required when co-administering these medications.
Immediately after using the medication, some patients may experience paradoxical bronchospasm or symptoms of laryngeal edema, wheezing, and breathlessness. In such cases, a fast-acting, short-acting bronchodilator should be used immediately. Seretide 25/50 should be discontinued immediately, and alternative treatment should be considered if necessary.
Immediate hypersensitivity reactions, such as anaphylaxis, urticaria, angioedema, rash, hypotension, and bronchospasm, may occur after using Seretide 25/50.
Seretide 25/50 should be used with caution in patients with cardiovascular disorders (especially arrhythmias, hypertension, and coronary artery disease) as it may cause seizures, hypertension, chest pain, tachycardia, restlessness, hypotension, headache, tremors, dizziness, discomfort, fatigue, nausea, and insomnia.
- Monitor and appropriately manage patients at high risk of reduced bone mineral density, including those with menopause, prolonged immobility, poor nutrition, smoking history, advanced age, family history of osteoporosis, or use of bone mass-reducing medications.
- Seretide 25/50 may slow growth in children. Regular monitoring of pediatric patients’ growth is required when using this medication. To minimize this side effect, the lowest effective dose should be used.
- Glaucoma, increased intraocular pressure, and cataracts may occur in asthma and COPD patients following prolonged use of Seretide 25/50. Therefore, close monitoring is necessary in patients with vision changes or a history of glaucoma, increased intraocular pressure, or cataracts.
- If asthma control with Seretide 25/50 worsens, patients should seek medical consultation immediately.
- Patients with asthma should not abruptly discontinue Seretide 25/50 inhalation, as this may lead to severe exacerbations. The dose should be gradually reduced under medical supervision. Similarly, COPD patients should be closely monitored when discontinuing the medication, as it may result in loss of symptom control.
- Use Seretide 25/50 with caution in individuals at risk of hypokalemia.
- Exercise caution when prescribing Seretide to patients with a history of diabetes.
- Drivers and machine operators should be aware of potential adverse effects of Seretide 25/50, including headache, joint pain, muscle pain, injury, cramps, angina, tachycardia, bronchospasm, shortness of breath, and anxiety.
- Consider the risks and benefits before using Seretide 25/50 in pregnant and breastfeeding women.
5. Drug Interactions of Seretide 25/50
Drug Interactions of Seretide 25/50 That Patients Should Be Aware Of:
- Avoid concurrent use of both selective and non-selective beta-blockers unless absolutely necessary.
- Ritonavir (a strong cytochrome P450 3A4 inhibitor) can increase fluticasone propionate plasma levels, significantly reducing serum cortisol levels. During the use of Seretide 25/50, interactions between inhaled fluticasone propionate and ritonavir may lead to systemic effects, including Cushing’s syndrome and adrenal suppression. Therefore, concurrent use of these two drugs should be avoided, except when prescribed by a physician after carefully weighing the benefits and risks.
- Exercise caution when using strong cytochrome P450 3A4 inhibitors, such as ketoconazole, as they can increase systemic fluticasone propionate levels.
- Concurrent use of ketoconazole and salmeterol (one of the active ingredients in Seretide 25/50) may increase plasma salmeterol levels, potentially prolonging the QTc interval.
- Seretide 25/50 should be used cautiously in patients receiving monoamine oxidase inhibitors (MAOIs) or tricyclic antidepressants (or those who have discontinued these medications within the past two weeks), as salmeterol’s effects on the vascular system may be significantly enhanced.
- Electrocardiogram (ECG) changes and hypokalemia caused by potassium-depleting diuretics may worsen with Seretide 25/50 use (especially if taken in excessive doses). Therefore, caution is required when using Seretide 25/50 concurrently with potassium-depleting diuretics.
Seretide 25/50 spray is quite complicated to use. Patients should follow all instructions from their doctor regarding how to use, dosage, duration of use, etc. to ensure treatment effectiveness and avoid unpredictable side effects.
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