I applied medication for tinea pedis but it doesn't help? Been using it 1.5 weeks already?

Takes a minimum . Of 2-4 weeks of religious use. If it is somewhat better in 1.5 weeks, stick with it. If not, then see a doctor and get a prescription for a different antifungal. In addition, sometimeswhat you think is tinea pedis is something else which needs to be diagnosed and treated properly.
See a doctor. If you have had no response after 1.5 weeks then it is time to see a podiatrist and make sure it is tinea and to switch treatment plans.