If you are considering combining Levitra with Flomax, talk to your healthcare provider. For your particular situation, he or she is in the best position to give recommendations for using these drugs together. Also, keep in mind that even though there does not seem to be a significant interaction between Flomax and Levitra, Cialis, or Viagra in most people, it is a good idea to use caution when combining these medications. Report any signs of low blood pressure (lightheadedness, dizziness, or fainting) to your healthcare provider right away.