No Cross-Tolerance Between Pregabalin & Gabapentin
Thought this might be of interest to those of you debating the existence of a cross-tolerance between the two compounds; according to
The FreePatentsOnline Database, there is none!
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DETAILED DESCRIPTION OF THE INVENTION
Gabapentin is the generic name for the marketed product Neurontin. The chemical name is 1-(aminomethyl)-cyclohexaneacetic acid. The chemical structure of the compound is:
Pregabalin is the generic name for (S)-3-(aminomethyl)-5-methylhexanoic acid. The chemical structure of the compound is: It is also known as CI-1008 and as S-(+)-3-IBG.
Formerly, it was thought that gabapentin and pregabalin were the same in all pain models as one antagonist blocked both; therefore, a similar result was expected.
However, surprising differences have now been observed in an inflammatory model of pain.
The present invention relates to pharmaceutical compositions. These compositions have a synergistic effect in the treatment of pain. Advantages of these compositions include fewer side effects as lower dosages are needed. This increases patient compliance with the beneficial result of better control of pain.
The drugs can be administered together in the same dosage unit or can be prepared in separate dosage units administered at the same time. Different forms of dosage units can be used, i.e., a tablet of gabapentin and an injection of pregabalin.
One particular advantage of the instant invention is the fact that no cross tolerance between the two compounds has been observed.
The synergistic composition of this invention utilizes any GABA analogs. A GABA analog is a compound derived from or based upon gamma-aminobutyric acid.
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CITATION
Brummel, Roger N. (321 Peppermill Lane, Holland, MI 49423, US), Singh, Lakhbir (4 Low Rd. Queen Adelaidem Ely, Cambridgeshire, CB7 3SP, GB) 2005 A SYNERGISTIC COMBINATION: GABAPENTIN AND PREGABALIN Warner-Lambert Company LLC (201 Tabor Road, Morris Plains, NJ 07950, US) EP1196160 http://www.freepatentsonline.com/EP1196160B1.html
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Will report back if I find anything a bit more specific!
~ vaya