I am trying to find out how long it takes Clonazepam to get working in your body ## I Have been taking vipedlowestdrugprices24-7.comc is Clonazepam for i take klonopin and it usually takes about minutes to fully kick in. i How long does it take for klonopin to start to work I heard it takes. So far i done 3 days takingmg twice a day. then i have done 3 days taking.5mg twice a day. tonite will be my 3 and half days of taking.5mg. Update- Life After Klonopin/Benzodiazepine Withdrawal Put the pill under your tongue and let dissolve. So it's been 12 hours. Wiki Research Mission Statement Donate! Add your Answer Find similar questions. Thank you Georgiatopcop for responding to the question.