Quinidine toxicity can manifest through various symptoms. The most common include cinchonism, which is characterized by symptoms such as tinnitus, headache, dizziness, and visual disturbances. In more severe cases, quinidine toxicity can lead to cardiac complications like torsades de pointes, a type of life-threatening arrhythmia, hypotension, and even cardiac arrest. Gastrointestinal symptoms such as nausea and vomiting may also occur.
