Generic Floxin can cause side effects. It is very important to contact a local doctor if an allergic reaction develops. If an individual begins to develop hives or has difficulty breathing it is best to get medical attention as soon as possible. Other side effects of generic Floxin include dizziness, sudden pain in or near the joints, bleeding, diarrhea, mild skin itching, headache or a feeling of anxiousness. All of these signs and symptoms need to be discussed with a local doctor before someone is to buy Floxin.