.. How to get extraordinary stimulating (and syringe)

Talk to Lonzo.

There should be some stimulant and syringe at Doctor Gizmo's office.

Turn the lever all the way up, again.

Maybe they are behind locks.

They are in the Doctor's Cabinet. But it is locked! Mistrust everywhere!

You won't probably get the key to the cabinet from Gizmo. Maybe you could access it in illegal ways?

There is a lock pick in Police Gizmo's ( Turn the lever in the middle position. ) office.

Change to Doctor's office mode ( Lever up ) and pick the lock of the Doctor's Cabinet with the lock pick.