Can I take a vicodin if I take Klonopin?

Any faster than that and you will likely experience withdrawal from extreme anxiety to physical shaking (tremors) to diarrhea to vomiting and severe headache and stomach aches to high blood pressure and pulse. Stopping very quickly or completely will increase these symptoms 100-fold. Plus you can add heart attack, stroke, seizures

(which I had and almost killed me. It took me 2 years to stop having dreams about Xanax after abruptly quitting 6mg/daily - a dose not actually recommended by the manufacturer or the FDA. My doctor kept upping my dose because the effects of Xanax quickly become ineffective (he should have switched me to Klonopin) and you need more and more for it to keep working. The more you take the more you need and the more your brain fights back to get what it needs, not wants, needs. Xanax in particular amongst benzos (but NOT exclusively-all benzos pose these threats) quickly, efficiently, and very effectively changes your brain chemistry and activity on a fundamental level and also more than other benzos tends to cause seizures when stopped or reduced too quickly. After my seizure I spent the next several weeks in In-Patient medical detox)

and even death. Yes, you read that correctly, you can just drop dead. You will also likely wish for death (I certainly did). These withdrawal dangers (let's not even call them symptoms) can last for months and months.
So, yes, take them together if you need to but what some of us are saying (unsolicited we understand) is that you should do everything possible to not take benzos regularly.

Using narcotic pain or cough medications together with other medications that also cause central nervous system depression can lead to serious side effects including respiratory distress, coma, and even death. Talk to your doctor if you have any questions or concerns. Your doctor may be able to prescribe alternatives that do not interact, or you may need a dose adjustment or more frequent monitoring to safely use both medications. Do not drink alcohol or self-medicate with these medications without your doctor's approval, and do not exceed the doses or frequency and duration of use prescribed by your doctor. Also, because these medications may cause dizziness, drowsiness, difficulty concentrating, and impairment in judgment, reaction speed and motor coordination, you should avoid driving or operating hazardous machinery until you know how they affect you. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

Interaction report:

https://www.drugs.com/interactions-check.php?drug_list=703-357,71-747

If the prescriber is aware you are taking Klonopin and still prescribed the pain killer or the other way around, your Dr. most likely is aware of this potential interaction, although as it is a potential major interaction, and you read what "major" means I can not tell you he/she outweighed the opposite that the benefit is greater than the risk.

I suggest you contact your Dr. and clarify this situation before taking the meds.