clonazepam (Rivotril) is a triazolobenzodiazepene which is just fancy way of saying it is a high potency benzo. It is a very effective anxiolytic medication but be careful of abrupt withdrawal or stopping it suddenly. Anxiety increases noradrenaline which aggravates tics. We often use medications like clonidine, an alpha two agonist, which also is used to reduce anxiety but specifically goes after peripheral adrenaline. One advantage of clonidine is that it does not have a cognitive effect (except sedation) where clonzepam can cause antrograde and retrograde amnesia.
Make sure you also consider non-pharma solutions like Tai Chi, TM, or Yoga