Abstract
To investigate whether patients develop true subsensitivity to antihistamines during chronic therapy, we studied 14 adult subjects who received chlorpheniramine for 3-day and 3-week trials of therapy. Titrated skin tests to histamine and compound 48/80, chlorpheniramine blood levels (by HPLC), compliance, and side effects were monitored and compared during the two courses of therapy and their respective 72-hour washout periods. We found a significant correlation between chlorpheniramine blood levels and skin test suppression during both the 3-day and 3-week therapies. The 3-day chlorpheniramine therapy was more clinically effective (measured by skin test suppression corrected for serum chlorpheniramine concentration) than the 3-week therapy (P < .01). Chlorpheniramine serum half-lives and 2-hour chlorpheniramine blood levels were not significantly different after the 3-day and 3-week trials. Compliance was significantly worse (P < .01) during 3-week therapy. Medication side effects (particularly drowsiness) were frequently reported during both courses of therapy. We conclude that subsensitivity to chlorpheniramine does develop in adult patients receiving 3 weeks of therapy. This subsensitivity is not explained by changes in drug metabolism. In addition to subsensitivity, poor compliance may contribute to sub-therapeutic results during chronic antihistamine therapy. Side effects from antihistamines may also require individualization of therapy for certain patients.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 341-346 |
| Number of pages | 6 |
| Journal | Annals of Allergy |
| Volume | 59 |
| Issue number | 5 |
| State | Published - 1987 |
ASJC Scopus subject areas
- Immunology and Allergy