Gastrointestinal bleeding is the most common cause of iron deficiency in adult men and menstrual blood loss is the leading cause of iron insufficiency in women, anemia due to iron deficiency is mostly caused by blood loss. Ferric carboxymaltose (FCM) is a contemporary parenteral iron formulation that may be used therapeutically to treat anemia caused by an iron deficiency [iron-deficiency anemia (IDA)]. The main goal of the trial was to evaluate FCM’s safety and efficacy in treating IDA. The Department of Hematology, Rajshahi Medical College Hospital, Rajshahi, Bangladesh participated in this quasi-experimental research, which comprised adult patients with IDA. Participants were given an intravenous (IV) infusion of 500 mg of FCM, diluted in 100 mL of 0.9% normal saline, throughout a 30-minute period after their participation. The second dosage of FCM was administered after a 7-day period of the first dose. The comparison of the outcomes [hemoglobin (Hb) level, serum ferritin level, and other hematological parameters] between the baseline and day 14 postintervention was done using a paired t-test. Compared to baseline, patients’ Hb levels rose considerably (p = 0.001) after FCM. Aside from serum ferritin level, additional hematological parameters that sharply increased were red blood cells (RBCs) count, mean corpuscular volume (MCV), mean corpuscular hemoglobin concentration (MCHC), red cell distribution width – coefficient of variation (RDW-CV), and iron indicators. The experiment recorded mild adverse effects such as fever, headaches, and gastrointestinal issues including vomiting, diarrhea, and constipation, but no significant adverse events. In summary, IDA may be effectively treated with FCM, a safe and secure IV medication that has no major negative effects.