"Rates of asthma prevalence in the United States are leveling off and possibly declining, but not among the poor, according to a study published online December 28 in Pediatrics.
Overall prevalence of childhood asthma doubled fr"...
(salmeterol xinafoate) Inhalation Powder
Long-acting beta2-adrenergic agonists (LABA), such as salmeterol, the active ingredient in SEREVENT® DISKUS®, increase the risk of asthma-related death. Data from a large placebo-controlled US trial that compared the safety of salmeterol with placebo added to usual asthma therapy showed an increase in asthma-related deaths in subjects receiving salmeterol (13 deaths out of 13,176 subjects treated for 28 weeks on salmeterol versus 3 deaths out of 13,179 subjects on placebo). Currently available data are inadequate to determine whether concurrent use of inhaled corticosteroids or other long-term asthma control drugs mitigates the increased risk of asthma-related death from LABA.
Because of this risk, use of SEREVENT DISKUS for the treatment of asthma without a concomitant long-term asthma control medication, such as an inhaled corticosteroid, is contraindicated. Use SEREVENT DISKUS only as additional therapy for patients with asthma who are currently taking but are inadequately controlled on a long-term asthma control medication, such as an inhaled corticosteroid. Once asthma control is achieved and maintained, assess the patient at regular intervals and step down therapy (e.g., discontinue SEREVENT DISKUS) if possible without loss of asthma control and maintain the patient on a long-term asthma control medication, such as an inhaled corticosteroid. Do not use SEREVENT DISKUS for patients whose asthma is adequately controlled on low-or medium-dose inhaled corticosteroids.
Pediatric and Adolescent Patients: Available data from controlled clinical trials suggest that LABA increase the risk of asthma-related hospitalization in pediatric and adolescent patients. For pediatric and adolescent patients with asthma who require addition of a LABA to an inhaled corticosteroid, a fixed-dose combination product containing both an inhaled corticosteroid and a LABA should ordinarily be used to ensure adherence with both drugs. In cases where use of a separate long-term asthma control medication (e.g., inhaled corticosteroid) and a LABA is clinically indicated, appropriate steps must be taken to ensure adherence with both treatment components. If adherence cannot be assured, a fixed-dose combination product containing both an inhaled corticosteroid and a LABA is recommended.
The active component of SEREVENT DISKUS is salmeterol xinafoate, a beta2- adrenergic bronchodilator. Salmeterol xinafoate is the racemic form of the 1-hydroxy-2- naphthoic acid salt of salmeterol. It has the chemical name 4-hydroxy-a1-[[[6-(4- phenylbutoxy)hexyl]amino]methyl]-1,3-benzenedimethanol, 1-hydroxy-2- naphthalenecarboxylate and the following chemical structure:
Salmeterol xinafoate is a white powder with a molecular weight of 603.8, and the empirical formula is C25H37NO4•C11H8O3. It is freely soluble in methanol; slightly soluble in ethanol, chloroform, and isopropanol; and sparingly soluble in water.
SEREVENT DISKUS is a teal green plastic inhaler containing a foil blister strip. Each blister on the strip contains a white powder mix of micronized salmeterol xinafoate salt (72.5 mcg, equivalent to 50 mcg of salmeterol base) in 12.5 mg of formulation containing lactose monohydrate (which contains milk proteins). After the inhaler is activated, the powder is dispersed into the airstream created by the patient inhaling through the mouthpiece.
Under standardized in vitro test conditions, SEREVENT DISKUS delivers 47 mcg of salmeterol base per blister when tested at a flow rate of 60 L/min for 2 seconds.
In adult subjects with obstructive lung disease and severely compromised lung function (mean FEV1 20% to 30% of predicted), mean peak inspiratory flow (PIF) through a DISKUS® inhaler was 82.4 L/min (range: 46.1 to 115.3 L/min).
The actual amount of drug delivered to the lung will depend on patient factors, such as inspiratory flow profile.
What are the possible side effects of salmeterol inhalation (Serevent Diskus)?
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have any of these serious side effects:
- chest pain, fast or pounding heartbeats, tremors, shaking, or restless feeling;
- skin rash, bruising, severe tingling, numbness, pain, muscle weakness;
- wheezing, choking, or other breathing problems after using this medication; or
- worsening asthma symptoms.
Less serious side effects may...
What are the precautions when taking salmeterol xinafoate (Serevent Diskus)?
Before using this medication, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.
Before using this drug, tell your doctor or pharmacist your medical history, especially of: heart problems (e.g., angina, irregular heartbeat), high blood pressure, diabetes, liver problems, seizures, thyroid problems (e.g., overactive thyroid).
Salmeterol may cause a condition that affects the heart rhythm (QT prolongation). QT prolongation can infrequently result in serious (rarely fatal) fast/irregular heartbeat and other symptoms (such as severe dizziness, fainting) that need medical attention right...
Last reviewed on RxList: 4/29/2014
This monograph has been modified to include the generic and brand name in many instances.
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