It's called Antabuse, appropriately named, and it does exactly that.    From Wordnik.com.  [CNN Transcript Oct 10, 2007] Reference

Disulfiram brand name Antabuse causes an unpleasant reaction if someone drinks while taking it.    From Wordnik.com.  [Drug cuts relapse rate for alcoholics] Reference

Disulfiram (brand name Antabuse) causes an unpleasant reaction if someone drinks while taking it.    From Wordnik.com.  [Drug cuts relapse rate for alcoholics] Reference

The orlistat ended up acting like Antabuse for fat.    From Wordnik.com.  [Low-carb over-the-counter-weight-loss-drug alert. | The Blog of Michael R. Eades, M.D.] Reference

Antabuse is the drug that alcoholics take to prevent their drinking.    From Wordnik.com.  [Low-carb over-the-counter-weight-loss-drug alert. | The Blog of Michael R. Eades, M.D.] Reference

It's a strong deterrent to drinking, much like the drug disulfiram, or Antabuse.    From Wordnik.com.  [In Search of Alcoholism Genes] Reference

GUPTA: I understand that Antabuse, you get quite ill if you drink alcohol while you're taking that.    From Wordnik.com.  [CNN Transcript Apr 1, 2006] Reference

Antabuse makes the relapsing alcoholic violently ill.    From Wordnik.com.  [Chicago Reader] Reference

It is unknown if Antabuse is excreted in breast milk.    From Wordnik.com.  [Wii-volution] Reference

A warning: Antabuse is a nasty chemical which will ruin your kidneys.    From Wordnik.com.  [Yahoo! Answers: Latest Questions] Reference

A sort of proto-Antabuse, if you will. 8 of 17 studies found it to be marginally effective.    From Wordnik.com.  [OnThePharm] Reference

Do not take Antabuse without first talking to your doctor if you are breast-feeding a baby.    From Wordnik.com.  [Wii-volution] Reference

I don't take Antabuse.    From Wordnik.com.  [My Times: Adventures in the News Trade] Reference

If you are, Antabuse will help.    From Wordnik.com.  [Planned Short-Term Treatment] Reference

MILLMAN: You tend not to drink on the Antabuse.    From Wordnik.com.  [CNN Transcript Apr 1, 2006] Reference

Alli is the equivalent of Antabuse for alcohol.    From Wordnik.com.  [Freakonomics in the Times Magazine: The Stomach-Surgery Conundrum - Freakonomics Blog - NYTimes.com] Reference

Antabuse.    From Wordnik.com.  [Discourse.net: More On Twin Cities - Developing] Reference

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Antabuse Syndrome.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Antabuse for infants.    From Wordnik.com.  [Chicago Reader] Reference

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Antabuse Dosing Guidelines.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference