... as eczema, psoriasis, and acne. It is also used for rheumatoid arthritis, weak bones (osteoporosis), Raynaud’s syndrome, ... peptic ulcer disease.Women use evening primrose oil in pregnancy for preventing high blood pressure (pre-eclampsia), shortening labor, ... and preventing late deliveries. Women also use evening primrose oil for premenstrual syndrome (PMS), breast pain, endometriosis, and symptoms ...