Hypertension & Arginine

So I read a book last year about "the blood pressure cure" and it recommended taking Arginine to help control blood pressure.  I take a daily regiment of vitamins and figured it wouldn't hurt - just to see the impact.  Although the impact was not great it did help drop it by about 5-8 points on a regular basis.  I tried to get of the prescribed medication - Lisinopril - but in the end have to stay on it since my blood pressure seems to go up to 150/95 without it.