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The term "heavy drink" is often used to describe a pattern of alcohol consumption that can lead to various health risks and social issues. However, there is no specific weight or gram measurement that defines a "heavy drink" objectively. Instead, the definition of a heavy drink is typically based on the quantity and frequency of alcohol consumption.

According to the National Institute on Alcohol Abuse and Alcoholism (NIAAA), a heavy drinker for men is someone who consumes 15 or more drinks per week, or 5 or more drinks per day on at least one occasion [1]. For women, a heavy drinker is defined as someone who consumes 8 or more drinks per week, or 4 or more drinks per day on at least one occasion [1].

It's important to note that a "drink" is defined as 14 grams (0.6 ounces) of pure alcohol [1]. Therefore, the weight of a heavy drink can vary depending on the type and volume of the alcoholic beverage consumed. For example, a standard 12-ounce (355-milliliter) can of beer containing 5% alcohol by volume (ABV) weighs approximately 14 grams of pure alcohol [2]. Similarly, a 5-ounce (148-milliliter) glass of wine containing 12% ABV also weighs around 14 grams of pure alcohol [2].

In summary, while there is no specific weight or gram measurement that defines a "heavy drink" objectively, a heavy drinker is typically defined as someone who consumes a certain quantity and frequency of alcohol. The weight of a heavy drink can vary depending on the type and volume of the alcoholic beverage consumed, but a standard drink contains approximately 14 grams (0.6 ounces) of pure alcohol.

Sources:

1. "Drinking Levels Defined." National Institute on Alcohol Abuse and Alcoholism. <https://www.niaaa.nih.gov/alcohol-health/overview-alcohol-consumption/moderate-binge-drinking>.
2. "How Many Standard Drinks Are in a Bottle or Can of Beer, a Glass of Wine, or a Shot of Liquor?" National Institute on Alcohol Abuse and Alcoholism. <https://www.rethinkingdrinking.niaaa.nih.gov/how-much-is-too-much/what-counts-as-a-drink/standard-drinks.aspx>.
3. "Alcohol Patents." DrugPatentWatch.com. <https://www.drugpatentwatch.com/drug/alcohol.html>.