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Drug interactions between C-Phen DM and Xopenex

Results for the following 2 drugs:
C-Phen DM (chlorpheniramine/dextromethorphan/phenylephrine)
Xopenex (levalbuterol)

Interactions between your selected drugs


phenylephrine ↔ levalbuterol

Applies to:C-Phen DM (chlorpheniramine/dextromethorphan/phenylephrine) and Xopenex (levalbuterol)

Consumer information for this interaction is not currently available.

MONITOR: Coadministration of beta-2 adrenergic agonists with other adrenergic agents may potentiate the risk of cardiovascular side effects. Beta-2 adrenergic agonists can produce clinically significant cardiovascular effects including increases in pulse rate and systolic or diastolic blood pressure as well as ECG changes such as flattening of the T wave, prolongation of the QTc interval, and ST segment depression. The risk is lower when beta-2 adrenergic agonists are inhaled at normally recommended dosages. However, these effects may be more common when the drugs are administered systemically or when recommended dosages are exceeded.

MANAGEMENT: Caution is advised if beta-2 adrenergic agonists are used concomitantly with other adrenergic agents, particularly in patients with cardiovascular disorders such as coronary insufficiency, cardiac arrhythmias, hypertrophic obstructive cardiomyopathy, or hypertension. Blood pressure and heart rate should be closely monitored.


  1. Wong CS, Pavord ID, Williams J, Britton JR, Tattersfield AE "Bronchodilator, cardiovascular, and hypokalaemic effects of fenoterol, salbutamol, and terbutaline in asthma." Lancet 336 (1990): 1396-9
  2. "Product Information. Foradil (formoterol)" Novartis Pharmaceuticals, East Hanover, NJ.
  3. "Product Information. Proventil (albuterol)." Schering Laboratories, Kenilworth, NJ.
View all 11 references

Drug Interaction Classification

The classifications below are a guideline only. The relevance of a particular drug interaction to a specific patient is difficult to determine using this tool alone given the large number of variables that may apply.

Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.

Do not stop taking any medications without consulting your healthcare provider.

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