CONTRAINDICATIONS, WARNINGS, AND INTERACTIONS
Topiramate is contraindicated in those hypersensitive to the drug. Topiramate should
be used with caution in those who have a history of urolithiasis, paresthesias,
secondary angle closure glaucoma, renal or hepatic impairment, and conditions or
therapies that predispose to acidosis (e.g., renal disease, severe respiratory
disorders, status epilepticus, diarrhea, surgery, ketogenic diet, or drugs). Monitoring
for hyperchloremic non–ionic-gap metabolic acidosis is essential, and therefore
baseline chemistry (e.g., HCO3
− and pH) should be assessed and monitored regularly
thereafter. Metabolic acidosis can cause symptoms such as tiredness and loss of
appetite, or more serious conditions including arrhythmia or coma. Topiramate has
been found to be teratogenic in animal studies and is a pregnancy category C
Concomitant use of oral contraceptives, phenytoin, carbamazepine, and valproic
acid has been found to interact with topiramate.
220 Coadministration of another
carbonic anhydrase inhibitor, such as acetazolamide, may increase the possibility of
renal stone formation and should be avoided.
COMORBIDITIES IN ALCOHOL USE DISORDER
It is quite common for patients who are involved in harmful drinking to have
comorbid medical issues. Alcohol has significant drug interactions with many
medications (Table 90-8). Clinicians must also consider the potential for comorbid
psychiatric disorders, (also known as dual diagnosis, e.g., depression, bipolar
disorder, or schizophrenia) combined with a substance use disorders. Tobacco and
caffeine dependence are common.
Increased comorbid conditions lead to a poorer
treatment prognosis for both medical and psychiatric conditions.
hepatotoxicity. Acute intoxication theoretically protects against acetaminophen toxicity
because less hepatotoxic metabolite is generated.
Anticoagulants (oral) Chronic ethanol consumption induces hepatic metabolism of warfarin, decreasing
hypoprothrombinemic effect. Very large acute ethanol doses (>3 drinks/day) may impair
the metabolism of warfarin and increase hypothrombinemic effect. Vitamin K-dependent
clotting factors may be reduced in alcoholics with liver disease, also affecting coagulation.
Antidepressants Enhanced sedative effects of alcohol and psychomotor impairment are possible. Acute
ethanol impairs metabolism. Fluoxetine, paroxetine, fluvoxamine, and probably other
serotonin reuptake inhibitors (SSRIs) do not interfere with psychomotor or subjective
Ascorbic acid Ascorbic acid increases ethanol clearance and serum triglyceride levels and improves
pentobarbital metabolism; chronic intoxication enhances hepatic pentobarbital metabolism.
Benzodiazepines Psychomotor impairment increases with the combination.
Bromocriptine Ethanol increases gastrointestinalside effects of bromocriptine.
Caffeine Caffeine has no effect on ethanol-induced psychomotor impairment.
Verapamil inhibits ethanol metabolism and increases intoxication.
Ethanol produces flushing, nausea, headaches, tachycardia, and hypotension.
Cephalosporin antibiotics that have an ethyl tetrazole thiolside chain produce this
disulfiram-like reaction (e.g., cefoperazone, cefamandole, cefotetan).
occur. Combined central nervous system (CNS) depression. Vasodilation, tachycardia,
Chloroform Ethanol increases chloroform hepatotoxicity.
Doxycycline Chronic consumption of ethanol induces hepatic metabolism of doxycycline and may
lower serum concentration of the antibiotic.
Erythromycin Ethanol may interfere with absorption of the ethylsuccinate salt. Effects on other
antagonists Cimetidine potentiates ethanol effects. Increases peak plasma ethanol concentrations and
area under the plasma ethanol concentration–time curve. CNS toxicity from increased
cimetidine serum concentration. Nizatidine and ranitidine may also increase blood alcohol
levels (BALs) slightly by inhibiting gastric alcohol dehydrogenase. Famotidine does not
When ethanol is ingested, nausea, flushing, light-headedness, and dyspnea may occur (i.e.,
a disulfiram-like reaction may occur with metronidazole). A sunburn-like rash has been
reported with ethanol consumption and ketoconazole. A similar reaction may occur with
itraconazole, although no reports exist.
Meprobamate Synergistic CNS depression may occur.
Metoclopramide Enhances sedative effects of ethanol.
Tyramine-containing alcoholic beverages (e.g., wines, beer) may cause a hypertensive
crisis. Pargyline may inhibit aldehyde dehydrogenase and cause a disulfiram-like
consumption. Clinicalsignificance unknown. Potential for enhanced CNS depression.
Chlorpropamide, tolbutamide, and tolazamide may cause flushing, light-headedness,
nausea, and dyspnea if alcohol is ingested (i.e., a disulfiram-like reaction).
Paraldehyde Possible metabolic acidosis may occur.
Phenothiazines Potentiates psychomotor effects of ethanol.
Quinacrine Possibly inhibits acetaldehyde oxidation.
Tetrachloroethylene Combined CNS depression may occur.
trichloroethylene drink alcohol.
Philadelphia, PA: Lippincott Williams & Wilkins; 2006, with permission.
Principles for the optimal treatment of patients with a dual diagnosis include the
following: (a) flexibility (e.g., although the goal of treatment may be abstinence, for
some patents, movement in the right direction is just as important to keep the person
engaged in treatment); (b) repetition (e.g., a constant refocusing of attention for
avoiding alcohol and for confronting their psychiatric symptoms is a priority); and
(c) counseling (e.g., matching patients to the appropriate intervention). These factors
are all fundamental to long-lasting treatment success. Medications, when appropriate
(e.g., early and vigorous drug intervention with nonaddictive medications), may also
help the patient stay in treatment; however, every effort must be made to use
medications that do not induce euphoria or cause dependence, and are effective and
Patients with both drug use and psychiatric disorders constitute a substantial and
challenging subpopulation. Treating the alcohol use disorder alone predicts a poorer
outcome for other disorders including early relapse. Early and aggressive treatment
for each condition should be implemented. Furthermore, care must be taken to ensure
that the medications prescribed are safe if combined with alcohol.
The author acknowledges the authors for their contributions to the following chapters
in previous versions of the textbook: Wendy O. Zizzo and Paolo V. Zizzo for their
chapter on Drug Abuse and George A. Kenna for his chapter on Alcohol Use
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