Quantifying Contraceptive Side-Effects: A Prospective Cohort Study of Symptom Burden, Risk Factors, and Daily Life Disruption in South-Central Ethiopia

Unwanted side-effects are the leading cause of dissatisfaction and discontinuation of hormonal contraceptives worldwide. Yet contraceptive side-effects are commonly dismissed as minor and/or misconceptions within global health, in part due to the paucity of quantitative data on side-effects symptoms. This research aimed to (1) compare changes in symptom number and severity among hormonal contraceptive users and a control group over a 3-months period, (2) identify risk factors for such changes, and (3) evaluate their impact on womens daily lives. We conducted an observational baseline-controlled prospective cohort study among injectable and implant users and a control group of non-users in Central Oromia, Ethiopia. Sociodemographic, diet, activity data and monthly side-effect symptoms were collected from pre-initiation to three months. Multilevel models adjusted for temporal autocorrelation were used to evaluate change in the number and severity of symptoms. Minimally adjusted models were used to identify risk factors for increased negative symptoms among contraceptive users and evaluate the impact of experiencing symptoms on womens daily activities. A total of 278 participants (106 injectable, 72 implant, 100 non-users) were included for analysis. Compared to pre-initiation, injectable users experienced 28% more symptoms at month 3 (adjusted incident rate ratio (IRR): 1.28, 95% CI: 1.05 - 1.57 p = 0.015), implant users experienced a peak of 41% more symptoms at month 2 (adjusted IRR 1.41, 95% CI: 1.15 - 1.73, p = 0.002), and non-users experienced no changes over a similar time period. Contraceptive users with physically demanding occupations, food insecurity, and a history of recent infection experienced the greatest symptom severity, also associated with negative impacts on womens activities, including work, chores, and relationships. These findings indicate that reducing the burden of contraceptive side effects requires addressing underlying health stressors and considering the significant impact of side-effects on womens daily lives, rather than relying solely on dispelling misconceptions. Key messagesO_ST_ABSWhat is already know on this topicC_ST_ABSO_LIExisting research lacks the data necessary to both identify risk factors for contraceptive side effects and assess the extent of daily disruptions caused by these symptoms. C_LI What this study addsO_LIThe design of this study enables us to demonstrate that side-effects are: (1) significant: users report an increase in symptoms after initiating contraception, unlike non-users who do not exhibit such changes; (2) predictable: women experiencing health stressors (nutritional, physical and infectious) prior to initiation report the greatest number and severity of side-effects when using hormonal contraception; (3) disruptive: higher symptom severity is associated with a decreased ability to carry out key daily activities pertaining to work, relationships, and house chores. C_LI How this study might affect research, practice and/or policyO_LIContraceptive counselling should be sensitive to variation in risk of side-effects and support women with high symptom burdens with management options or method switching, rather than dismissing concerns as misconceptions. C_LIO_LIOur findings highlight the need for further research confirming predictive drivers of side-effect experiences to guide counselling and to move towards personalised contraceptive technology development. C_LI