See the DrugPatentWatch profile for Metronidazole
Metronidazole is an antibiotic used to treat a variety of infections [1]. Propylene glycol is a solvent and humectant that is often used in pharmaceutical formulations [2]. When combined, metronidazole can be formulated with propylene glycol for specific applications [3].
Why is Propylene Glycol Used in Metronidazole Formulations?
Propylene glycol acts as a solvent in liquid formulations of metronidazole, helping to dissolve the active drug ingredient [3]. It can also contribute to the stability and shelf-life of the medication [2]. In topical preparations, it can help the drug penetrate the skin [4].
What Types of Infections Does Metronidazole Treat?
Metronidazole is effective against anaerobic bacteria and certain parasites [1]. It is commonly prescribed for infections of the:
* Gastrointestinal tract (e.g., C. difficile colitis) [5]
* Vaginal tract (e.g., bacterial vaginosis, trichomoniasis) [6]
* Skin and soft tissues [7]
* Bones and joints [7]
* Central nervous system [7]
* Respiratory tract [7]
Are There Different Forms of Metronidazole Available?
Yes, metronidazole is available in various forms, including oral tablets and capsules, intravenous solutions, and topical gels and creams [8]. The choice of formulation depends on the type and location of the infection [8]. Metronidazole with propylene glycol is typically found in liquid or topical preparations [3, 4].
What Are the Potential Side Effects of Metronidazole?
Common side effects of metronidazole can include nausea, vomiting, diarrhea, headache, and a metallic taste in the mouth [1]. More serious side effects, though less common, can include nerve damage, seizures, and severe allergic reactions [1]. When formulated with propylene glycol, particularly in topical applications, some individuals may experience local irritation or allergic reactions to the propylene glycol itself [2, 4].
How Does Metronidazole Work?
Metronidazole is a prodrug that is activated by anaerobic microorganisms. Once activated, it disrupts bacterial DNA synthesis and causes strand breaks, leading to cell death [1].
Can Metronidazole Be Used During Pregnancy or Breastfeeding?
The use of metronidazole during pregnancy and breastfeeding should be discussed with a healthcare provider. While generally considered safe in certain trimesters, risks and benefits must be weighed [1].
What Are the Drug Interactions for Metronidazole?
Metronidazole can interact with several other medications, including warfarin (increasing bleeding risk), lithium, and alcohol (causing a disulfiram-like reaction) [1]. It is important to inform your doctor about all medications you are taking [1].
How Should Metronidazole be Stored?
Oral metronidazole tablets and capsules should be stored at room temperature, away from light and moisture [8]. Liquid and topical formulations, especially those containing propylene glycol, should be stored according to package instructions, often at room temperature but protected from extreme temperatures [2, 4, 8].
Sources:
[1] https://www.drugs.com/metronidazole.html
[2] https://www.drugbank.ca/drugs/DB00536
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7701402/
[4] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3970812/
[5] https://www.nhs.uk/medicines/metronidazole/
[6] https://www.plannedparenthood.org/learn/stis/trichomoniasis
[7] https://www.webmd.com/drugs/2/drug-9708/metronidazole-oral/details
[8] https://medlineplus.gov/druginfo/meds/a681002.html