This study aims to test a medicine called NMD670 for people with **Type 3 Spinal Muscular Atrophy (SMA)**. SMA is a disease that makes muscles weak. Type 3 means patients can walk but might have trouble doing so over long distances. We will check if NMD670 is safe and helps these patients.
Eligibility: We are looking for adults who can walk at least 50 meters without help, have a body mass index (BMI) between 19-35, and have a genetic confirmation of SMA. You must not have other diseases that affect muscles, nor have had certain surgeries.
- **Study Length**: Lasts several months, with regular check-ups.
- **Visits Required**: You will need to visit the clinic multiple times.
- **Compensation**: You may receive compensation for your time and travel.
Participants must agree to use birth control and be willing to sign a consent form. If interested, ensure you haven't used other experimental treatments recently. This study helps us learn if NMD670 can be a new treatment for SMA Type 3.