Severity of Adverse Effects of Sinovac COVID-19 Vaccine in Postmenopausal Women: A Multicenter Experience From Pakistan

Introduction The most significant element in halting the coronavirus disease 2019 (COVID-19) epidemic was the availability of reliable and efficient vaccines. Vaccine acceptability is influenced by many factors, including perceptions of the vaccine’s safety and side effects. Adverse reactions to vaccines can vary with regard to the type, although they are frequently mild, localized, temporary, and self-limiting. Therefore, this study aimed to assess the prevalence of side effects experienced by postmenopausal women after receiving the Sinovac vaccine. Methods This multicenter, prospective cross-sectional study was carried out at multiple centers in Karachi, Pakistan. In this study, the non-probability sampling method was used. The study continued from August 1, 2022, to January 31, 2023, for six months. The study comprised 600 postmenopausal women over the age of 50 years who received two doses of Sinovac COVID-19 vaccination. Demographic parameters such as gender, the existence of comorbidities, and local and systemic side effects in postmenopausal women were documented as frequencies and percentages. Age, weight, and duration of comorbidities are expressed as means and standard deviations. Results The study findings showed that the mean age of study participants was 63.93 ± 8.24 years. There were related comorbidities with hypertension and diabetes mellitus in 181 (30.2%) and 40 (6.7%) women, respectively. Fever was the most often reported side effect, with 349 (58.2%) participants reporting it and 198 (56.7%) participants reporting it as mild. After the second dose, 234 (39.5%) participants reported fever as their most frequent adverse effect, and 158 (67.5%) of them reported it was mild. Conclusion This study concluded that the most commonly reported side effects among postmenopausal women were fever, pain, and swelling at the injection site after getting either dose of Sinovac vaccine. These overall side effects were generally mild to moderate in intensity, not life-threatening, and did not require hospitalization, although fever was reported in severe intensity in some cases, particularly after the first dose.