Histamine release from human leucocyte suspensions of healthy volunteers (n=14) after 1 hour incubation with β blockers (0.01 M) used in treatment of glaucoma
| β blocker | Mean (SD) histamine release (%) |
| Betaxolol | 88.5 (5.1) |
| Metipranolol | 78.8 (6.9) |
| Timolol | 18.5 (11.5) |
| Carteolol | 0 (0) |