I am taking 30 mg oxycontin 2 times daily and percocet for break through pain... having real bad spasm in my lower back and my meds have not even touch it... doc gave me a sample of SOMA..how long should I wait before I take it..answer please... hurtingI am taking 30 mg oxycontin 2 times daily and percocet for break through pain... having real bad spasm in my lower back and my meds have not even touch it... doc gave me a sample of SOMA..how long should I wait before I take it..answer please... hurting