What is the best base voot to prepare a hair lotion (or creme) with Betamethasonediprop, chlorhexidine (under Any form) and erythromycin in terms of stability and bioavailability. This on

A betamethasone dipropionate (BMDP) Hydroalocoholian solution for application to the scalp is described in the TMF. This solution can be added without problem chlorhexidinedigluc or-diacetate. Erythromycin fear I will be incompatible because of the of PH, which is detrimental to BMDP.