Pain-free is defined as mild, moderate, or severe headache pain becoming none at 2 hours postdose during the first attack.

To evaluate the 2 out of 3 primary consistency endpoint, the results of ITT evaluable attacks in the lasmiditan 100-mg and 200-mg groups will be assessed, and the ITT-evaluable attacks treated with placebo in the control group will be used for comparison. For participants with more than 3 ITT evaluable attacks, only the first 3 will be considered. Pain-free was defined as mild, moderate, or severe headache pain becoming none at the indicated assessment time.

Percentage of participants who were headache pain free (defined as moderate or severe pain becoming none) at 2 hours postdose.

Headache response is a binary response variable derived from the headache intensities recorded in the participant diary. Headache response is defined as a reduction in headache severity from moderate or severe at baseline to mild or no headache, at two hours after initiation of infusion of study drug.

Pharmacokinetics (PK): Maximum Observed Drug Concentration (Cmax) of Lasmiditan.

PK: Area Under the Concentration-Versus-Time Curve (AUC) from Time Zero to Infinity (AUC\[0-∞\]) of Lasmiditan.

Maximum observed plasma concentration of lasmiditan.

Time of maximum observed plasma concentration; if it occurs at more than one time point, Tmax is defined as the first time point with this value

Area Under the Concentration Versus Time Curve (AUC) from time zero to tlast (AUC\[0- tlast\]) of lasmiditan.

Area Under the Concentration Versus Time Curve (AUC) from time zero to infinity (AUC\[0-inf\]) of lasmiditan.

Amount excreted in urine (calculated as total lasmiditan concentration multiplied by volume of urine)

Fraction of dose excreted in urine (Ae / dose)

Renal Clearance is the volume of blood or plasma that is completely cleared of the drug by the kidneys per unit time. (Ae(0-t)/AUC0-T)

Vital signs were measured in semi-supine position after 5 minutes rest. Serial vital signs assessed when lasmiditan is administered alone and when sumatriptan is administered alone compared to when lasmiditan and sumatriptan are administered together.

Vital signs were measured in semi-supine position after 5 minutes rest. Serial vital signs assessed when lasmiditan is administered alone and when sumatriptan is administered alone compared to when lasmiditan and sumatriptan are administered together.

Vital signs were measured in semi-supine position after 5 minutes rest. Serial vital signs assessed when lasmiditan is administered alone and when sumatriptan is administered alone compared to when lasmiditan and sumatriptan are administered together.

Vital signs were measured in semi-supine position after 5 minutes rest. Serial vital signs assessed when lasmiditan is administered alone and when sumatriptan is administered alone compared to when lasmiditan and sumatriptan are administered together.

Vital signs were measured in semi-supine position after 5 minutes rest. Serial vital signs assessed when lasmiditan is administered alone and when sumatriptan is administered alone compared to when lasmiditan and sumatriptan are administered together.

A standard, digital 12-lead ECG with a 10-second rhythm strip was used to assess cardiac function after participants have been at least 5 minutes supine. Serial ECGs collected when lasmiditan administered alone and when sumatriptan is administered alone compared to when lasmiditan and sumatriptan are administered together.

A standard, digital 12-lead ECG with a 10-second rhythm strip was used to assess cardiac function after participants have been at least 5 minutes supine. Serial ECGs collected when lasmiditan administered alone and when sumatriptan is administered alone compared to when lasmiditan and sumatriptan are administered together.

A standard, digital 12-lead ECG with a 10-second rhythm strip was used to assess cardiac function after participants have been at least 5 minutes supine. Serial ECGs collected when lasmiditan administered alone and when sumatriptan is administered alone compared to when lasmiditan and sumatriptan are administered together.

A standard, digital 12-lead ECG with a 10-second rhythm strip was used to assess cardiac function after participants have been at least 5 minutes supine. Serial ECGs collected when lasmiditan administered alone and when sumatriptan is administered alone compared to when lasmiditan and sumatriptan are administered together.

A standard, digital 12-lead ECG with a 10-second rhythm strip was used to assess cardiac function after participants have been at least 5 minutes supine. Serial ECGs collected when lasmiditan administered alone and when sumatriptan is administered alone compared to when lasmiditan and sumatriptan are administered together.

A standard, digital 12-lead ECG with a 10-second rhythm strip was used to assess cardiac function after participants have been at least 5 minutes supine. Serial ECGs collected when lasmiditan administered alone and when sumatriptan is administered alone compared to when lasmiditan and sumatriptan are administered together.

A standard, digital 12-lead ECG with a 10-second rhythm strip was used to assess cardiac function after participants have been at least 5 minutes supine. Serial ECGs collected when lasmiditan administered alone and when sumatriptan is administered alone compared to when lasmiditan and sumatriptan are administered together.

Safety assessed from time of consent through end of study. A summary of all reported serious adverse events (SAE) and other adverse events regardless of causality are provided in the adverse events module of this record.

Maximum observed plasma concentration.

Apparent elimination rate constant, estimated by linear regression of the terminal linear portion of the log concentration versus time curve.

Terminal elimination half-life, calculated as ln(2)/λZ.

The standard deviation of lateral position (SDLP) is the primary parameter used as stable measure of driving performance with high test-retest reliability. It measures the driver's ability to stay in a constant position within the driving lane. Variations in the lateral position are recorded and analyzed. SDLP, was analyzed using a mixed model with fixed effects for sequence, period, and treatment, and a random effect for participant within sequence. A variance component covariance structure and Kenward-Roger degrees of freedom was used.