Contraceptives are used mainly to prevent unintended pregnancies and this is ensured by consistent and correct use of contraceptives to prevent contraceptive failure. Appropriate use and counselling on side effects contribute to the consistent and correct use of contraceptives therefore maintaining the desired effectiveness. To assess the prevalence, types, level of knowledge on the correct use and prevalence of side effects of hormonal contraceptives among women of reproductive age at Kenyatta National Hospital.