* Vistaril = Hydroxyzine, anantihistamine used for anxiety, nausea, and allergies.
* Meclizine (Antivert) is also an antihistaminebut is used primarily formotion sickness and vertigo.
#Reference:FDA Approved Drug List, PTCE Medication Guide.

The product, strength, and dosage form.

The most stringent

Following formula:
Final volume X % (expressed as a decimal)= amount of active ingredient(g). The final volume is 30ml and
1 :200 can be expressed as 1/200 or 0.005g. Multiplying 0.15g x 1000mg/g (changing grams to milligram...)
will yeald 150mg.