My sodium intake is around 4, 000-4, 500 mg a day. is this harmful?

Probably not: Most people with normally functioning kidneys can handle large amounts of sodium (you are ingesting the equivalent of 1 ramen noodle package per day), however, if you have any tendency towards hypertension you may increase the likelihood of hypertension and its long term consequences.

See below: General recommendation to patients with hypertension is 2300 mg of sodium and this is applicable to general population as well.