Ker je učinkovit odmerek blizu odmerka, pri katerem postanejo stranski učinki resni, je treba povečanja odmerka izvajati strogo in pod nadzorom zdravnika, ki je posebej usposobljen za zdravljenje motenj spanja.
Since the effective dose is close to the dose at which side effects become serious, increases in dose must be carried out strictly and under the supervision of a doctor specialised in the treatment of sleep disorders.