Parsley is used for urinary tract infections (UTIs), kidney stones, (GI) disorders, constipation, jaundice, intestinal gas, indigestion, colic, diabetes, cough, asthma, fluid retention (edema), osteoarthritis, (anemia), high blood pressure, prostate conditions, and spleen conditions. It is also used to start menstrual flow, to cause an abortion, as an aphrodisiac, and as a breath freshener.
 
Cautions and Side Effects Of Parsley:
Pregnancy and breast-feeding: Parsley in food amounts is fine, but parsley in larger medicinal amounts is LIKELY UNSAFE when taken by mouth during pregnancy.

Diabetes: Parsley might lower blood sugar levels. Watch for signs of low blood sugar (hypoglycemia) and monitor your blood sugar carefully if you have diabetes and use parsley.Fluid retention (edema): There is a concern that parsley might cause the body to hold onto sodium (salt), and this increases water retention.
High blood pressure: There is a concern that parsley might cause the body to hold onto sodium (salt), and this could make high blood pressure worse.
Kidney disease: Don’t take parsley if you have kidney disease. Parsley contains chemicals that can make kidney disease worse.
Surgery: Stop using parsley at least 2 weeks before a scheduled surgery.