Sempresto got FDA responses to a Type B pre-IND meeting request covering 10 questions about its smartphone integrated epinephrine auto-injector. The agency answered in writing rather than holding the meeting. Sempresto said the answers were generally consistent with its development assumptions.

The product is going down the 505(b)(2) New Drug Application route, not a 510(k). An epinephrine auto-injector is a combination product whose primary mode of action is the drug, so CDER runs the review and the device constituent is assessed inside it. Founders who think of an injector as hardware usually learn that the hard way.

Sempresto is based in Weston, Massachusetts and licensed the underlying technology exclusively from Thomas Jefferson University in November 2025. CEO Elizabeth Reczek called the responses an important regulatory milestone.