Rhonal® was a microfine preparation of acetyl salicylic acid (aspirin) used to treat coryza, fever and infections during the flu season, and body aches in general. The drug was made from a coated ethylcellulose tablet containing micro-grains of acetyl-salicylic acid, to favor a progressive diffusion and release of the anti-inflammatory agent. The coating and the specific formulation were innovative at this time. Interestingly, the manufacturing process was underlined, with the term “technical success” in the accompanying advert.
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