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Bencoprim is a prescription drug, a very powerful one, and thus it is obtained only by prescription. A physician should evaluate you before prescribing the medication to you, and provide you a dose that takes an evaluation into consideration.
The guidelines for doseage are as follow:
Initial dose: 5 mg orally 3 times a day.
Based on individual patient response, the dose may be increased to either 7.5 mg or 10 mg three times a day. (Reference: http://www.drugs.com/dosage/cyclobenzaprine.html#Usual_Adult_Dose_for_Muscle_Spasm
As far as interaction between these three drugs, there has been no reported interaction. You can read about this here: http://www.drugs.com/interactions-check.php?drug_list=1310-0,758-386,1463-869
I hope this answers all your questions.
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