Nutrient enema:

A nutrient enema, also known as feeding per rectum, rectal alimentation, or rectal feeding, is an enema administered with the intent of providing nutrition when normal eating is not possible. Although this treatment is ancient, dating back at least to Galen, and commonly used in the Middle Ages, and still a common technique in 19th century medicine, Nutrient enemas have been superseded in modern medical care by tube feeding and intravenous feeding.

A variety of different mixes have been used for nutrient enemas throughout history. A paper published in Nature in 1926 stated that because the rectum and lower digestive tract lack digestive enzymes, it is likely that only the end-products of normal digestion such as sugars, amino acids, salt and alcohol, will be absorbed.

Notoriously, the treatment was given to U.S. President James A. Garfield after his shooting in 1881, and is asserted to have prolonged his life.

Douche:

Douche usually refers to vaginal irrigation, the rinsing of the vagina, but it can also refer to the rinsing of any body cavity. A douche bag is a piece of equipment for douching—a bag for holding the fluid used in douching. To avoid transferring intestinal bacteria into the vagina, the same bag must not be used for an enema and a vaginal douche.

References:

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2. ^ COUGHLIN, P; MAVOR, A (1 October 2006). "Arterial Consequences of Recreational Drug Use". European Journal of Vascular and Endovascular Surgery 32 (4): 389–396. doi:10.1016/j.ejvs.2006.03.003.

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4. ^ Helen Ogden-Grable; Gary W. Gill (2005-08-17). "Selecting The Venipuncture Site". American Society for Clinical Pathology. p. 4. Retrieved 2008-12-22.

5. ^ ^{a b c d e f g h i} Safer Injecting - Australian Intravenous League & National Hepatitis C Education and Prevention Program, 2000.http://harmreduction.org/pubs/pamphlets/AIVLsafer_injecting.pdf

6. ^ Filtering licit and illicit drugs for injecting. Sarah Lord and Damon Brogan, VIVAIDS Inc.http://www.alcoholandwork.adf.org.au/article_print.asp?ContentID=filtering_licit_and_illicit_dr

7. ^ Mathers BM, Degenhardt L, Phillips B, et al. (November 2008). "Global epidemiology of injecting drug use and HIV among people who inject drugs: a systematic review". Lancet 372 (9651): 1733–45. doi:10.1016/S0140-6736(08)61311-2. PMID 18817968.

8. ^ Helpern, Milton (1977). "An Epidemic of Sorts". Autopsy : the memoirs of Milton Helpern, the world's greatest medical detective. New York: St. Martin's Press. p. 73. ISBN 0312062117.

9. ^ Helpern, Milton (1977). "An Epidemic of Sorts". Autopsy : the memoirs of Milton Helpern, the world's greatest medical detective. New York: St. Martin's Press. p. 77. ISBN 0312062117.

10. ^ Halbsguth, U; Rentsch, K M; Eich-Höchli, D; Diterich, I; Fattinger, K (2008). Oral diacetylmorphine (heroin) yields greater morphine bioavailability than oral morphine: bioavailability related to dosage and prior opioid exposure. British Journal of Clinical Pharmacology, 66(6):781-791. https://www.zora.uzh.ch/9903/