The invention relates to an antiseptic tampon and a method of preparing it, which method consists of introducing metered quantities of a liquid mixture of antiseptic product and hydrophobic excipient into individual sheaths (14) for packaging tampons, then introducing standard tampons (22) into said sheaths (14) so that their lower ends are immersed in the mixture of antiseptic product and excipient, and then closing and sealing said sheaths (14).