Antiperspirants, on the other hand, contain aluminum salts that help stop perspiration. That is, they have an effect on the structure or function of the body, so they fall under the FDAâs over-the-counter drug regulation and must carry an expiration date, though they donât really need one.
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What is Nitrous Oxide. Nitrous oxide use for labor pain is a mixture of 50% nitrous gas and 50% oxygen that is inhaled through a mask or mouthpiece that a woman holds and self-administers, as she wishes. A version of nitrous oxide is used widely in dental offices, where most people know of it as laughing gas.