A Survey of Patients' Understanding of Drowsiness as Side Effect of 2nd Generation Antihistamines

Abstract

  Purpose: Many types of antihistamines used for the treatment of allergic rhinitis induce drowsiness as a side effect. Whether or not patients taking the internal drugs know of this untoward effect is a matter of importance. Recently we conducted a questionnaire survey to know how many patients are aware of this.
  Method: The subjects were 257 patients who visited our hospital for treatment of alergic rhinitis and took the prescription from February through March this year. The patients filled in a questionnaire given at the window of the dispensary. All the participants in this survey gave their informed consent.
  Results: Effective replies (90.3%) were obtained from 232 patients (mean age: 53.5±17.5; sex: 85 males and 147 females). Of those respondents, 45 individuals (19.9%) said they did not know that the antihistamines produce drowsiness. Furthermore, the survey found that 24 out of the 45 individuals were actually taking the type of antihistamine that caused drowsiness and 21 individuals were not given any explanation of the side effect by their doctors. The patients said that if they knew of the side effect they would not have taken the medicine. Moreover, it was found that 10 out of the 21 patients drove their cars while they felt drowsy.
  Conclusions: The survey revealed the hard fact that the drowsiness as side reaction the patients might have after taking antihistamines was made light of. The findings brought home to us the importance of giving clear directions to the patients about the medicine and the precaution against the side effects.