What would be the order of greater or lesser bioavailability of the dosage forms?

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Intravenous administration bypasses the digestive system and provides 100% bioavailability, making it the most efficient route. Oral administration is subject to first-pass metabolism, reducing bioavailability compared to intravenous but generally higher than rectal and topical routes. Rectal administration can bypass part of the first-pass metabolism, offering variable but generally lower bioavailability than oral. Topical administration is typically the least efficient in terms of bioavailability due to the barriers posed by the skin.

What Would Be the Order of Greater or Lesser Bioavailability