Intentional antifolates are used to treat conditions such as cancer and psoriasis.
Incidental antifolates interfere with B9 as a side effect of the drug, and though not intentionally used to treat a condition, can still lead to low B9.
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Lists of medications which deplete folic acid:
Beaufort Hospital
https://www.bmhsc.org/health-and-wellness/education-support/health-library/article?productId=107&pid=33&gid=000722
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St Luke's Hospital
https://www.stlukes-stl.com/health-content/medicine/33/000722.htm
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Penn State Hershey Medical Center
http://pennstatehershey.adam.com/content.aspx?productid=107&pid=33&gid=000722
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Folic acid deficiency linked to mental illness, and used as treatment for improving mental illness:
MTHFR gene
Methylenetetrahydrofolate reductase and psychiatric diseases
Transl Psychiatry. 2018; 8: 242. Published online 2018 Nov 5. doi: 10.1038/s41398-018-0276-6
PMCID: PMC6218441
PMID: 30397195
Lin Wan,1 Yuhong Li,1 Zhengrong Zhang,2 Zuoli Sun,2 Yi He,2 and Rena Li1,2,3
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6218441/
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NAMI St. Louis › 2016/11PDF
Folate and Mental Illness FACT SHEET - NAMI St. Louis - a download
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.namistl.org/wp-content/uploads/sites/144/2016/11/folate_factsheet.pdf&ved=2ahUKEwic9oXJ_8bpAhVVCM0KHZTJDegQFjAMegQIAxAB&usg=AOvVaw2li76rd3U7WRKTGGhvPYxJ
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Medscape Psychiatry & Mental Health eJournal [TM]
Nutrition and Depression: The Role of Folate
https://www.medscape.com/viewarticle/431514_4
©Deborah Barges, June 2020, reprintable and usable per open access rules.