Lower lip deviation after Botox may be amenable to some degree of correction depending upon the actual muscles involved.
Solution of Deviation of Lower Lip Following Botox?
Doctor Answers 4
Lower Lip Deviation after Botox
Botox and lips
Sorry, it's very difficult to answer your question without more information - you should consider posting a photo or explaining in further detail.
Botox and lip deviation
More information is needed but I assume you had Botox injected into the lip. After about 4 months the Botox will wear off and things should be relatively back to where they started.
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Deviation of lower lip after Botox
I'm sorry, but more information is really needed to answer your question. Where exactly was the Botox placed? How much was used? What was being treated? A picture showing your issue would be helpful as well.