What is a permissible dosage form of ephedrine in combination with guaifenesin?

The permissible dosage form of ephedrine in combination with guaifenesin must adhere to specific federal regulations that limit the maximum amounts of ephedrine that can be used in combination products. In this context, the combination of guaifenesin and ephedrine is often used in cough and cold formulations, and regulatory agencies have established maximum dosage limits for safety and efficacy.

The selected dosage form containing guaifenesin 400mg and ephedrine 25mg per dosage unit falls within the intended regulatory framework. This combination balances the effectiveness of the active ingredients in assisting with cough and congestion, while remaining compliant with dosage limits set forth by the Food and Drug Administration (FDA).

The other dosage forms listed may exceed the allowable limits for ephedrine or may not provide the optimal balance necessary for therapeutic efficacy and safety in combination with guaifenesin. Therefore, the selected dosage form (guaifenesin 400mg/ephedrine 25mg) reflects the regulated standards for such combined medications.