GRLS data [Power / Sample Size]
you are right, there's no open data regarding Chloropyramine.
By the way GRLS says that at least 2 companies performed BEQ studies. The sample size was (unfortunately we don't know exactly what 'the number of patients' means - sample size? number of subjects intended to be screened?) not more than 22 and 40. I would say this is not HVD.