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As such there is no significant interaction between the coca plant extracts and kava kava root.
However, coca plant is known to contain cocaine except for the medicinal used preparations which may not contain the cocaine.
They both are known stimulants and so one can have excessive stimulation with the simultaneous use that can cause anxiety, insomnia and tremors.
So, it's up to you that what you are experiencing with the co administration. If you have any undesirable side effects, then you should avoid the co administration.
I would highly recommend you to use only the medicinal preparations and not the pure leafs or extracts as they can cause side effects as well as addiction too.
I hope it helps you.
If you have any further query, please ask me.
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