About this trial
This randomized controlled trial compares daily versus alternate-day oral iron supplementation in pregnant women with iron deficiency anemia during the second trimester. The study evaluates changes in hemoglobin and serum ferritin, treatment adherence, and gastrointestinal side effects to inform more patient-centered, physiologically aligned dosing strategies.
Eligibility criteria
This trial does not accept healthy volunteersQualifiers
Aged 18 to 40 years
Pregnant women in the second trimester (13 to 27 weeks gestation)
Hemoglobin below 11 g/dL with serum ferritin below 30 ng/mL
Singleton pregnancy
Disqualifiers
Known congenital or acquired hemoglobin disorders (e.g., thalassemia, hemoglobinopathies)
Chronic diseases affecting hemoglobin levels (e.g., chronic kidney disease, inflammatory disorders)
Bleeding disorders or a history of frequent blood loss
Gastrointestinal conditions impairing nutrient absorption (e.g., celiac disease or other malabsorption syndromes)
Trial design
Parallel
Treatments tested in this trial
Ferrous Sulfate
DrugOral ferrous sulfate 325 mg tablets (approximately 65 mg elemental iron per tablet) administered for four weeks according to the assigned dosing schedule. All participants receive standardized counseling on administration, diet, side effects, and adherence, and are issued a dose diary.
Treatment groups
Trial outcomes
Primary outcomes
Change in hemoglobin from baseline to Week 4
Mean within-participant change in hemoglobin concentration (g/dL), measured at baseline and at Week 4, compared between the daily and alternate-day arms.
Secondary outcomes
Change in serum ferritin from baseline to Week 4
Mean within-participant change in serum ferritin concentration (ng/mL) from baseline to Week 4, compared between groups.
Treatment adherence
Proportion of participants taking at least 80 percent of prescribed doses, determined by pill count cross-checked against patient dose diaries.
Frequency of gastrointestinal side effects
Proportion of participants reporting any gastrointestinal side effect (nausea, vomiting, constipation, metallic taste, or abdominal discomfort) recorded using a structured checklist.
Severity of gastrointestinal side effects
Severity of reported gastrointestinal side effects graded as mild, moderate, or severe on a structured checklist.
Sponsors and contacts
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