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Amlodipine is a drug that is used for angina, arrhythmias, chest  pain, and hypertension. It can stay in your system for between 7  and 10 days.   Yes, there's no problem in taking those 2 drugs together. However, Nyquil might contains phenylephrine or pseudoephedrin and this drug might increase blood pressure (froâ¦m 5-10 mmhg).
Relevance. Rating Newest Oldest. Best Answer: The time that a drug takes to leave your system is usually measured by its half life, meaning the time it takes for half of the drug's metabolic by-products to leave your system. I just looked up kava kava,and read that it has a half life of 9 hours.