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Last Updated: March 30, 2025

Claims for Patent: 6,291,488

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Summary for Patent: 6,291,488

Title:	Preventing protozoal infections
Abstract:	The invention relates to combinations of atovaquone and proguanil, their use in the treatment and prophylaxis of parasitic infections such as protozoal parasitic infections, e.g., malaria and toxoplasmosis, and infections caused by P. carinii and their use in the manufacture of medicaments for the treatment and/or prophylaxis of such infections. The combinations can conveniently be administered in a single pharmaceutical formulation. Preferably, atovaquone and proguanil are administered in a potentiating ratio so that they act in synergy.
Inventor(s):	Gutteridge; Winston Edward (Beckenham, GB), Hutchinson; David Brian Ashton (Beckenham, GB), Latter; Victoria Susan (Beckenham, GB), Pudney; Mary (Beckenham, GB)
Assignee:	Glaxo Wellcome Inc. (Research Triangle Park, NC)
Application Number:	09/678,485
Patent Claims:	1. A method for the prophylaxis of malaria in mammals which comprises administering 2-[4-(4-chlorophenyl)cyclohexyl]-3-hydroxy-1,4-naphthoquinone and 1-(4-chlorophenyl)-5-isopropylbiguanide hydrochloride in a ratio of 1:1 to 3:1. 2. A method for the prophylaxis of malaria in mammals which comprises administering 2-[4-(4-chlorophenyl)cyclohexyl]-3-hydroxy-1,4-naphthoquinone and 1-(4-chlorophenyl)-5-isopropylbiguanide hydrochloride in a ratio of 5:2. 3. A method according to claim 1 or claim 2 wherein 2-[4-(4chlorophenyl)cyclohexyl]-3-hydroxy-1,4-naphthoquinone is administered either concomitantly or sequentially with 1-(4-chlorophenyl)-5-isopropylbiguanide hydrochloride. 4. A method according to claim 1 or claim 3 wherein 2-[4-(4-chlorophenyl)cyclohexyl]-3-hydroxy-1,4-naphthoquinone and 1-(4-chlorophenyl)-5-isopropylbiguanide hydrochloride is administered concomitantly and in a single composition. 5. A method according to claim 1 or claim 2 wherein the 2-[4-(4-chlorophenyl)cyclohexyl]-3-hydroxy-1,4-naphthoquinone is in the form of the trans isomer or a mixture of the cis and trans isomers in which the trans isomer predominates.

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