Final answer:
Naltrexone is used to reduce cravings in alcohol dependence, which is true. The temperance movement was impacted by new social conditions like urbanization and immigration, also true.
Step-by-step explanation:
Naltrexone is indeed used to reduce cravings associated with alcohol dependence, making the statement true. It resembles the drug naloxone in its actions, but naltrexone has the advantage of being well-absorbed orally and has a longer duration of action, needing only one dose to be effective for an entire day. Supplied often in a 50 to 100 mg dose, it is quite effective in narcotic treatment programs. When used by individuals, subsequent injection of an opiate will result in reduced or no effect due to the naltrexone's antagonist properties. This characteristic makes it particularly effective for the treatment of narcotic dependence, particularly in addicts who have strong motivations to remain drug-free.
The temperance movement in history was indeed influenced by social conditions such as increasing urbanization and immigration, thus marking the statement as true. These changing conditions brought about new societal challenges and views on the consumption of alcohol, fueling the desire for reduced alcohol consumption and, in some cases, the push for prohibition.