This study is testing whether a drug called **dexamethasone**, delivered by a **special catheter** (Bullfrog® Micro-Infusion Device), can reduce inflammation in veins after a **Deep Vein Thrombosis (DVT)** procedure. DVT is when a blood clot forms in a deep vein, usually in the leg. This can cause pain and swelling. The goal is to see if this treatment can stop new clots from forming and improve symptoms for up to 2 years. To join, you must be 18-89 years old and have had DVT symptoms for 14 days or less before treatment. You'll need to follow a specific medication plan after the procedure. Certain health conditions and recent surgeries mean you can't participate. **Key Points:** - **Participation Duration:** Up to 24 months with multiple follow-up visits. - **Medications:** Post-procedure medications for at least 12 months. - **Compensation:** Details not provided; check with study organizers. This study involves following certain health guidelines closely, so consider if you can commit to the full duration and requirements.