The MTT assay results presenting the analyzed compounds and combinations activity: (A)—AmB, C1, and C1+AmB activity against C. albicans biofilms, (B)—AmB, NTBD, and NTBD+AmB activity against C. albicans biofilms, (C)—AmB, C1, and C1+AmB activity against C. parapsilosis biofilms, (D)—AmB, NTBD, and NTBD+AmB activity against C. parapsilosis biofilms, *—the statistically significant differences (p < 5%) in the metabolic activity of Candida biofilms treated with AmB, thiadiazole derivatives and their combinations compared with the control, #—the statistically significant differences (p < 5%) in the metabolic activity Candida biofilms treated with thiadiazole derivatives + AmB compared with biofilms subjected to AmB.