Drug General Information (ID: DDIZMX51TI)
  Drug Name Sibutramine Drug Info Propylhexedrine (nasal) Drug Info
  Drug Type Small molecule Small molecule
  Therapeutic Class Appetite Depressants Decongestants
  Structure

 Mechanism of Sibutramine-Propylhexedrine (nasal) Interaction (Severity Level: Moderate)
     Additive hypertensive effects Click to Show/Hide Mechanism Graph
Could Not Find 2D Structure
      Drug Name Sibutramine Propylhexedrine (nasal)
      Mechanism 1 Hypertensive effects Hypertensive effects
      Key Mechanism Factor 1
Factor Name Hypertensive effects
Factor Description Hypertension is defined as a blood pressure reading above a prescribed limit (130/90 mmHg). Most people with hypertension have no signs or symptoms; others may experience: severe headache, shortness of breath, nosebleeds, severe anxiety, and feeling a tingling sensation in the neck or head.
      Mechanism Description
  • Additive hypertensive effects by the combination of Sibutramine and Propylhexedrine (nasal) 
     Increased risk of rapid heart rate Click to Show/Hide Mechanism Graph
Could Not Find 2D Structure
      Drug Name Sibutramine Propylhexedrine (nasal)
      Mechanism 2 Increased heart rate Increased heart rate
      Key Mechanism Factor 2
Factor Name Tachycardia
Factor Description A faster-than-normal heart rate, but the heart is beating normally. Tachycardia may not cause any symptoms or complications, but if left untreated, some forms of tachycardia can lead to serious health problems, including heart failure, stroke, or sudden cardiac death.
      Mechanism Description
  • Increased risk of rapid heart rate by the combination of Sibutramine and Propylhexedrine (nasal) 

Recommended Action
      Management Caution is advised if sibutramine is coadministered with other drugs that can increase blood pressure and/or heart rate. Blood pressure and pulse should be measured prior to initiating therapy with sibutramine and monitored at regular intervals thereafter. Dose reduction or discontinuation of sibutramine should be considered in patients who experience a sustained increase in blood pressure or pulse rate.

References
1 Mendelson J, Jones RT, Upton R, Jacob P 3rd "Methamphetamine and ethanol interactions in humans." Clin Pharmacol Ther 57 (1995): 559-68. [PMID: 7768079]
2 Product Information. Didrex (benzphetamine) Pharmacia and Upjohn, Kalamazoo, MI.
3 Product Information. Meridia (sibutramine). Knoll Pharmaceutical Company, Whippany, NJ.