Single-center, single-dose, open-label, 2-part, 3-period crossover (in each part), pharmacokinetic and safety study.

Phase 1, open-label, 2-part, single-dose pharmacokinetic and safety study of STS101 in healthy subjects. Part 1 was designed to identify a dose level of STS101 for administration in Part 2. Subjects in Part 1 received 3 ascending doses of STS101 in a 3-period crossover manner. During Part 2, subjects received the dose of STS101 selected from Part 1, 1.0 mg DHE mesylate IM injection, and 2 mg DHE mesylate nasal spray in a randomized, 3 period crossover manner.

Inclusion Criteria:

• 18 to 50 years of age at the time of enrollment.
• Signed the informed consent document.
• Subject judged to be healthy by a qualified physician

Exclusion Criteria:

• Abnormal physical findings of clinical significance at the screening examination
• Significant abnormal laboratory values at the Screening Visit.
• Clinically significant symptoms or conditions that may have placed the subject at an unacceptable risk as a participant in the trial, or that may have interfered with the absorption, distribution, metabolism or excretion of the IMP.