Truvada is just one of the family of HIV drugs produced by Gilead Sciences, which medicates about 75 percent of people treated for HIV, and all of those treatment regimens retail between $1,000 and $2,500 for 30 tablets.
There are various reasons why some authors have sparsely populated canons. Some die young or relatively young. Some deal with ill health. Some feel they've said all they want to say in their minimal output.