Rare Case of Late-onset Myasthenia Gravis in a 65-year-old Female with Prolonged Doxycycline Use

Myasthenia gravis (MG) is a rare autoimmune condition caused by antibody-mediated disruption of acetylcholine receptors (AChR) or their associated proteins. The age onset MG has bimodal distribution, with predominance female cases in the second and third decades male sixth to eighth decades. often unmasked stressors such as systemic illness, medication, surgery, pregnancy. We present case late-onset 65-year-old recent history prolonged doxycycline use. However, there are aspects her past medical history, including comorbidities involving immune system numerous drug intolerances that should have increased clinical suspicion for MG. Additionally, one event preceded symptom was pneumonia treated doxycycline. This suggests be used caution patients, considered part differential diagnosis older patients presenting neurologic symptoms suggestive history.