Can i take fluconazole, phenazopyridine, and sulfamethoxazole tmp ds together?

Theoretically, coadministration with other agents that can prolong the QT interval may result in additive effects and increased risk of ventricular arrhythmias, So you should seek prompt medical attention if you experience any of these symptoms: dizziness, lightheadedness, fainting, palpitation, irregular heart rhythm, shortness of breath, or syncope

These drugs are frequently taken all together or in combination, usually for urinary tract infections concurrent with a yeast vaginitis. As long as you are not allergic/hypersensitive to any of the 3 and are not pregnant, and have no known significant heart, liver or kidney disease it should not be a problem.