The Objective of This Phase 1 Study is to Evaluate the Food Effect of 100 mg Hezkue Turbo® (ASP-001.1, Sildenafil) Under Fed Versus 100 mg of Hezkue Turbo® (ASP-001.1, Sildenafil) Under Fasted Conditions in Healthy Adult Male Subjects

This is a Phase 1, open-label, single-center, two-period, two-treatment crossover study designed to evaluate the pharmacokinetics (PK), food effect, safety, and tolerability of ASP-001.1 (oral liquid suspension of sildenafil) under fed versus fasted conditions in healthy adult male participants. The crossover design ensures that each participant receives ASP-001.1 under both fed and fasted conditions, allowing for direct within-subject comparison of the pharmacokinetic parameters. The study aims to determine the effect of food on the absorption and bioavailability of ASP-001.1 and to assess its safety and tolerability, including the potential for oral irritation, dizziness, or headache.

Subjects will be randomly assigned to one of two sequences for the crossover study:

* Sequence 1: ASP-001.1 under fasted conditions in Treatment Period 1, followed by ASP-001.1 under fed conditions in Treatment Period 2. * Sequence 2: ASP-001.1 under fed conditions in Treatment Period 1, followed by ASP-001.1 under fasted conditions in Treatment Period 2.

Randomization will occur after screening and prior to Treatment Period 1 dosing.