Abstract: Sustained-release compositions comprising a macrolide compound, a surfactant, a co-solvent, and a solvent. The sustained-release compositions of this invention may be parenterally administered to animals, and are useful for preventing or treating helminth, acarid or arthropod endo- or ectoparasitic infection or infestation in warm-blooded animals for prolonged periods of time.

Abstract: The invention relates to certain stable microsphere compositions containing a fat, a wax or a mixture thereof; an active ingredient selected from LL-F28249&agr;-&lgr; compounds, 23-oxo or 23-imino derivatives of LL-F28249&agr;-&lgr; compounds, milbemycin compounds and avermectin compounds; an antioxidant and, optionally, an oil, a semi-soft fat, a fatty acid derivative or mixture thereof. The invention also relates to a method for introducing and maintaining levels of the active compound in the blood of warm-blooded animals for extended periods of time and for the prevention or treatment of infections and infestations caused by helminths, nematodes, acarids and endo- and ectoparasitic arthropods in warm-blooded animals by the parenteral administration of compositions of the invention.

Abstract: Sustained-release compositions comprising a macrolide compound, a surfactant, a co-solvent, and a solvent. The sustained-release compositions of this invention may be parenterally administered to animals, and are useful for preventing or treating helminth, acarid or arthropod endo- or ectoparasitic infection or infestation in warm-blooded animals for prolonged periods of time.

Abstract: The invention relates to implants for the parenteral administration of an essentially uniform and continuous amount of a biologically active protein, peptide or polypeptide over an extended period of time which comprises a compacted, indented and partially coated composition containing from one to three layers of a homogeneous core mixture comprising about 20% to about 80% of a biologically active protein, a peptide or a polypeptide; about 10% to about 75% of a fat, a wax or a mixture thereof; 0% to about 25% of a buffer, a salt, a sugar or a mixture thereof; 0% to about 15% of a filler, on a weight basis of the total weight of the core mixture. The partial coating of a semipermeable material comprises about 5% to about 50%, on a weight basis of the total weight of the implant. The invention also relates to methods for increasing and maintaining elevated blood levels of biologically active proteins, peptides and polypeptides in animals by the administration of said implants.