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Dimenhydrinate

Dimenhydrinate, also known by the trade names Dramamine and Gravol, is an over-the-counter drug used to prevent motion-sickness (emesis). It is closely related to diphenhydramine HCl, or Benadryl. The differences relate to the weight-for-weight potency (50mg dimenhydrinate contains 30mg of the drug diphenhydramine), delay of action (dimenhydrinate must dissociate into diphenhydramine and its counterion in the body before it is active, therefore diphenhydramine produces effects sooner), and degree of sedation produced. more...

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Chemically, dimenhydrinate is a salt of two drugs: diphenhydramine(+) and 8-chlorotheophyllinate(-). Chlorotheophyllinate is a chlorinated form of the drug theophylline. The chlorination provides the necessary charge to associate with diphenhydramine as a solid. Theophylline is very closely related to caffeine and theobromine, mild central nervous system stimulants. It was thought that by combining the antiemetic effects of diphenhydramine with a stimulant, the extreme drowsiness induced by the former could be mitigated somewhat by the latter. In actuality, the sedation caused by diphenhydramine is substantially stronger than the stimulation caused by chlorotheophyllinate. Diphenhydramine, an ethanolamine-class antihistamine, is found in most OTC sleep aids and allergy preparations, such as Tylenol PM and Benadryl. It is primarily a H1-antagonist, but also possesses an antimuscarinic effect. It is used in Dramamine to produce and prevent nausea and emesis, however the development of the chemical meclizine has overtaken its usage (marketed as "Dramamine II") due to the fact that meclizine doesn't produce as much drowsiness.

Abuse

Recreational drug users sometimes take several times the recommended dose of dimenhydrinate in order to attain an intense and long-lasting state of anticholinergic delirium.

The mental effects are described by many as "dreaming while awake" involving visual and auditory hallucinations which, unlike those experienced with recreational drugs known as psychedelics, often cannot be readily distinguished from reality. Users often report a highly unpleasant side effect profile consistent with tropane glycoalkaloidal poisoning. This includes dry mouth and eyes, rapid heart beat (tachycardia), somnolence, insomnia, and extreme malaise. This is due to antagonism of muscarinic acetylcholine receptors in both the central and autonomic nervous system, inhibiting various signal transduction pathways.

In the CNS, diphenhydramine readily crosses the blood-brain barrier, exerting effects within the visual and auditory cortex, accounting for reported visual and auditory disturbances. Other CNS effects occur within the limbic system and hippocampus, causing confusion and temporary amnesia. Toxicology also manifests in the autonomic nervous system, primarily at the neuromuscular junction, resulting in ataxia and extrapyramidal side-effects, and at sympathetic post-ganglionic junctions, causing urinary retention, pupil dialation, tachycardia, and dry skin & mucous membranes. Considerable overdosage can lead to myocardial infarction, serious ventricular dysrhythmias, coma and death. Such a side-effect profile is thought to give ethanolamine-class antihistamines a relatively low abuse liability.

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Fixed drug eruption to ibuprofen in daughter and father - Case Reports
From Journal of Drugs in Dermatology, 12/1/03 by Khalid Al Aboud

Fixed drug eruption (FDE) is a common cutaneous reaction which may be seen in reaction to several medications. The usual etiologic agents associated with FDE are phenazones, sulfonamides, and tetracyclines. Often the causative agent is made out from the patient's history; in some cases, oral challenge or topical testing may be required. The pathophysiology of FDE is unclear. Cell-mediated, rather than humoral immunity is thought to be involved. Herein we report a case of FDE in a daughter and father.

**********

Case Report

A 14-year-old girl was evaluated for recurrent multiple erythematous plaques on her extremities (Figure 1). They had developed five hours following intake of ibuprofen for toothache. Her past history revealed similar eruptions the previous year with the same drug for sialadenitis. Cutaneous examination revealed localized erythematous macules on the hands, legs, and thighs. Some were dusky red. Skin biopsy revealed a mild perivascular mononuclear cell infiltrate, and scattered lymphocytes and neutrophils were present in the epidermis. The clinical and histopathological findings supported our impression of FDE. On a subsequent visit the father of this patient also reported similar reactions after taking ibuprofen for osteoarthritis. He had brownish post-inflammatory macules on the trunk (Figure 2) and thighs.

[FIGURE 1-2 OMITTED]

Discussion

Ibuprofen is 2-(4-isobutyl-phenyl)-propionic acid which belongs to the same group of nonsteroidal anti-inflammatory drugs (NSAIDs) as naproxen and ketoprofen. Skin reactions to ibuprofen include FIDE, contact dermatitis, and photosensitivity (1). FDE affecting families have been uncommonly reported (27). In one reported case it was due to cotrimoxazole (2), in another case due to tetracycline in a mother and son (3). In another report (4) FDE was reported in a mother after ingestion of dimenhydrinate or ace tylsalicylic acid and in her son after intake of either of the drugs with 'junk food'. This occurrence was investigated in detail in a family whose members including a girl who along with her grandmother and 2 great aunts developed FDE following use of pyrazolone derivatives (5); the authors performed HLA class I and II typing for 36 unrelated patients with FIDE and found higher frequencies of B22 and Cwl antigens suggesting a genetic predisposition (6).

It is clear that familial FDE can occur with different drugs. Therefore, it is important to inquire into the history of drug reactions in the family members when taking history. This may unearth instances that come to light only at the time of clinical presentation. The situation is akin to patients with anti-convulsant hypersensitivity syndrome (AAD guidelines) where detailed history of drug eruption in the family should be obtained at the time of recording history.

References:

(1.) Diaz Jara M. Perez Montero A, Gracia Bara MT, Cabrerizo S, Zapatero L. Martinez Molero MJ. Allergic Reactions Due to Ibuprofen in Children. Pediatr Dermatol 2001; 18(1):66-67.

(2.) Ozkaya-Bayazit E, Bayazit H. Ozarmagan G. Drug related clinical pattern in fixed drug eruption. Eur J Dermatol 2000: 10(4):288-91.

(3) Jolly HW Jr. Sherman IJ Jr, Carpenter CLJr. Nesbitt LT Jr. Meek TJ Jr. Fixed drug eruption to tetracyclines. Arch Dermatol 1978; 114(10): 1484-5.

(4.) Hatzis J. Noutsis K. Hatzidakis E, Bassioukas K, Perissios A. Fixed drug eruption in a mother and her son. Cutis 1992; 50(1):50-2.

(5.) Pellicano R, Ciavarella G, Lomuto M. Di Giorgio G. Genetic susceptibility to fixed drug eruption: evidence for a link with HLA B22. J Am Acad Dermatol 1994; 30(1):52-4.

(6.) Pellicano R, Silvestris A, Iannantuono M, Ciavarella G, Lomuto M. Familial occurrence of fixed drug eruptions. Acta Derm Venerol 1992: 72(4):292-3,

(7.) Gulati R, Bhargava P. Mathur NK. Fixed drug eruption due to multi-vitamin multi-mineral preparation as part of familial poly sensitivity. J Assoc Physicians India 1999; 47(2):253.

(8.) AAD Guidelines/Outcomes Committee, AAD Task Force. Guidelines of care for cutaneous adverse drug reactions. J Am Acad Dermarol 1996; 35(3):458 462.

KHALID AL ABOUD MD, V RAMESH MD, KHALID AL HAWSAWI MD

DERMATOLOGY UNIT, DEPARTMENT OF MEDICINE, KING FAISAL HOSPITAL, TAIF, SAUDI ARABIA

ADDRESS FOR CORRESPONDENCE: Khalid Al Aboud MD PO Box 5440 Makkah, Saudi Arabia Phone: 966-2-738-2444 Fax: 966-2-738-4719 E-mail: amoa65@hotmail.com

COPYRIGHT 2003 Journal of Drugs in Dermatology
COPYRIGHT 2004 Gale Group

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