Chlorhexidine gluconate Purified water q.s. Make a solution such that 1 tsp diluted to 1 gallon with water equals a 1:4200 w/v solution. Sig: 1 tsp diluted to 1 gallon for external use q.s. 80 mL How much chlorhexidine gluconate should be used in preparing the prescription? What would be the concentration of chlorhexidine gluconate in the solution prepared by the pharmacist, expressed as mg/mL?

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