This study tests whether a new medicine called *MANP* can help lower high blood pressure in adults who have a hard time controlling it despite taking multiple medications. *Hypertension* is a condition where blood pressure in the arteries is too high. Participants will receive either the MANP injection or a placebo (a harmless shot) to compare effects. The study uses a tool called *24-hour ambulatory blood pressure monitoring (ABPM)* to check blood pressure throughout the day.

Key Points:

• The study lasts for several months, and participants need to attend regular check-ups.
• Participants cannot be women who can become pregnant, and certain health conditions like recent heart issues or severe kidney problems will disqualify candidates.
• Eligible participants are adults aged 18-80, already taking three or more different blood pressure medications.

Before joining, participants must meet certain health criteria, like blood pressure levels and kidney function. The study involves some health risks, as with any medical trial, but it aims to find better ways to manage hard-to-treat high blood pressure.