Testosterone replacement products bring in billions for drug companies each year. Some experts say that number could reach $5 billion by 2017.
Critics say drug companies pushed misleading ads to men seeking the fountain of youth.
In 2014, the consumer watchdog group Public Citizen petitioned the FDA to include a black box warning on safety labels. The agency initially responded to the petition by saying the FDA has not concluded that FDA-approved testosterone treatment increases the risk of stroke, heart attack, or death. But in 2015, the FDA reconsidered and ordered drug makers to add stroke and heart attack warnings to labels and safety information.
Now, eight lawsuits that allege testosterone drugs caused heart attacks and blood clots will be heading to trial in 2017, according to court documents.