Anything that works on the GABA receptors will ease your anxiety, and a good deal of the withdrawal, but most anything that works on GABA is also addictive and the withdrawal from something that works on GABA receptors can cause seizures and death if discontinued abruptly. The minor withdrawal symptoms from GABA active drugs is pretty rough, especially mentally. Ideally, if one plans to detox doing a taper, I would just do so with the opiates and some iboga, rather than adding more addictive pharmaceuticals with their own set of side effects and withdrawal symptoms..
Of course, this is my opinion, because I have a great deal of distrust for pharmaceutical companies and western medicine. The reason is because that nearly every pharmaceutical prescribed, only treats symptoms. Almost none of them, with the exception of antibiotics, actually cure anything. I think for my mental health, there are much safer, healthier, natural remedies available, but they were all made illegal using propaganda and smear campaigns. Luckily, MAPS and other countries have gotten studies approved, to further look into many of nature's illegal gifts.