This question examines adverse drug reactions and contraindications. Option A, diabetic patients may increase their risk of hypoglycemia or hyperglycemia after taking gatifloxacin. Option B, the anticonvulsant Park Jung Su can cause valvular heart disease; Option C, long-term use of cephalosporins such as cefoperazone leads to vitamin K deficiency and coagulation disorder; D option, pefloxacin, a fluoroquinolone drug, can cause achilles tendinitis and affect bone growth and development; E option, statins can cause myalgia and myasthenia, and lethal rhabdomyolysis can occur when combined with gemfibrozil or nicotinic acid.