Hainan Star Pharmaceutical Co., Ltd.

Primary Objective: To investigate the relative bioavailability of a single (fasting) oral dose of 30 mg (5 mL) fexofenadine hydrochloride oral suspension (specification: 120 mL: 0.72 g, batch number: Y2503020, manufactured by Hainan Star Pharmaceutical Co., Ltd.) and the reference formulation fexofenadine hydrochloride oral suspension (trade name: Children's Allegra Allergy®, specification: 30 mg/5 mL, batch number: 5CTA968, manufactured by Sanofi-Aventis Deutschland GmbH) in healthy adult participants in China. Pharmacokinetic parameters of the two formulations were analyzed, and their bioequivalence was evaluated, providing a reference for the drug's application and clinical use. Secondary Objective: To evaluate the safety of a single (fasting) oral dose of 30 mg (5 mL) of the test formulation and the reference formulation in healthy adult participants in China.

1) Compare the pharmacokinetic parameters of the investigational drug and the control drug under fasting conditions in healthy participants, examine the rationality of blood sampling and dosage settings, and verify the blood drug concentration analysis method. 2) Examine the safety of the investigational drug and the control drug in healthy participants.

Primary Study Objective: To investigate the pharmacokinetic characteristics of a single oral dose of 0.75 μg of the test formulation, edirol soft capsules (strength: 0.75 μg/capsule, manufactured by Hainan Star Pharmaceutical Co., Ltd.) and the reference formulation, edirol soft capsules (trade name: EDIROL®, strength: 0.75 μg/capsule, manufactured by Chugai Pharmaceutical Co., Ltd.), in healthy Chinese adult volunteers under fasting and fed conditions, and to evaluate the bioequivalence of the two formulations after oral administration in the fasting and fed states. Secondary Study Objective: To evaluate the safety of a single oral dose of 0.75 μg of the test formulation and the reference formulation in healthy Chinese adult volunteers under fasting and fed conditions.