In general, it takes about 6 hours for metronidazole effervescent tablets to melt in the body. Metronidazole effervescent tablets contain drugs that can inhibit bacteria, and when melted, they can become effervescent and distribute the active ingredients widely throughout the vagina, so they are often used to treat various gynecological inflammatory diseases caused by bacterial infections with good therapeutic effects. Metronidazole tablets are administered vaginally and need to be inserted deep into the vagina, so you need to pay attention to hygiene when inserting the medication and keep your hands clean. Metronidazole tablets are usually finished after 6 hours of vaginal administration. During the use of this medication, sexual intercourse should be prohibited. It is important to note that Metronidazole effervescent tablets are not recommended for use during menstruation and are not recommended for use by pregnant or nursing women. After 7 days of use, if symptoms are not relieved, you should go to a regular hospital gynecology department promptly.