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The information below will assist you in determining. when to order more oxygen. The most frequently used portable oxygen cylinder is the E tank. When full, it contains enough. oxygen to supply a person using a flow rate of 2 liters per minute for about 4 hours. Please refer. to the tank duration chart to determine how long your tank will last based on the liter flow. prescribed by your physician.
My pharmacist advised that the bottle was good for up to 60 days after opening as long as its kept cool. I find no drop off of effectiveness going to 60 days. I believe it is a waste to through it out after 28 days because I still have over 80% of the bottle left after 28/30 days. As stated, and from what I was told. all insulin should be descarded after 30 days of first use.