Less serious side effects include, mild stomach upset, heartburn, diarrhea, constipation, bloating, gas, blurred vision and a ringing in the ears. The more serious and life threatening side effects of generic Feldene are chest pain, weakness, shortness of breath, slurred speech combined with vision loss and loss of balance, black, bloody or tarry stools, coughing up blood or vomit that looks like coffee grounds, swelling or rapid weight gain, cessation of urination, nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools and yellowing of the eyes and skin, fever, sore throat and headache with a servere blistering, redness and peeling skin rash, bruising, tingling, numbness, pain and muscle weakness, or fever, headache, still neck, chills, sensitivity to light, purple spots on the skin and seizures. Some of these more serious symptoms can be controlled by adjusting size of the dose of Feldene, so order Feldene online to have an adequate supply of medication when your local doctor needs to make adjustments in your medicating.