In recent years, deep eutectic solvents (DESs) with their outstanding solubilization properties have emerged as strong candidates for oral enabling formulations of poorly soluble drugs. This study explores the use of drug-based therapeutic DESs (THEDESs) to solubilize a poorly soluble compound with the aim of providing a fixed-dose combination of two complementary therapeutic agents. Specifically, potential anticancer effects of ibuprofen (IBU) are harnessed in a novel type of THEDES to dissolve higher amounts of abiraterone acetate (AbAc), an antitumor agent. Four IBU-based combinations were studied: 1:4 M ratio with octanoic acid (OctA), 1:5 with nonanoic acid (NonA), 1:3 with decanoic acid (DeA) or 1:2 with dodecanoic acid (DoA). Fatty acids of different chain lengths were analyzed and discussed considering surface charge densities obtained via quantum chemistry. The THEDESs listed could apparently dissolve AbAc amounts up to 1311.0 ± 125.4 mg/g in IBU:OctA THEDES, 1151.7 ± 22.2 mg/g in IBU:NonA, 1160.4 ± 33.5 mg/g in IBU:DeA, and 231.3 ± 10.7 mg/g in IBU:DoA. In vitro dissolution of the simultaneously released drugs reached 37.8 ± 9.0 % to 64.2 ± 1.0 % for IBU and 5.0 ± 3.3 % to 19.4 ± 0.1 % for AbAc. This increased to between 60.4 ± 2.8 % and 79.4 ± 5.0 % of released IBU, and 23.6 ± 1.0 % to 57.3 ± 5.8 % of released AbAc, with 20 % (w/w) Tween 80 added to the formulations. This showed the significant potential of drug-containing THEDESs as solubilizing agents for poorly soluble drugs, in the form of fixed-dose combinations of synergistic APIs.

University of Applied Sciences and Arts Northwest Switzerland School of Life Sciences Institute of Pharma Technology Hofackerstr 30 CH 4132 Muttenz Switzerland

University of Basel Department of Pharmaceutical Sciences Klingelbergstrasse 50 4056 Basel Switzerland; Zentiva k s U Kabelovny 130 102 00 Praha 10 Czech Republic; University of Applied Sciences and Arts Northwest Switzerland School of Life Sciences Institute of Pharma Technology Hofackerstr 30 CH 4132 Muttenz Switzerland

Zentiva k s U Kabelovny 130 102 00 Praha 10 Czech Republic

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