The invention provides novel pharmaceutical compositions based on semifluorinated alkanes which are useful as carriers for a broad range of active ingredients. Preferred active ingredients include poorly water-soluble and/or hydrolytically sensitive drug substances. The compositions are designed as suspensions and have superior physical properties which make them highly useful as pharmaceutical delivery systems. The compositions may be administered topically into the eye, or injected via the subcutaneous or intramuscular route. The invention further provides kits comprising such compositions.