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In page Atypical trigeminal neuralgia:

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If the anti-seizure drugs are found ineffective, one of the tricyclic antidepressant medications, such as amitriptyline or nortriptyline, may be used. The tricyclic antidepressants are known to have dual action against both depression and neuropathic pain. Other drugs which may also be tried, either individually or in combination with an anti-seizure agent, include baclofen, pregabalin, and opioid drugs such as oxycodone or an oxycodone/paracetamol combination.[citation needed]