"Doxy PEP, when offered, should be implemented in the context of a comprehensive sexual health approach, including risk reduction counseling, STI screening and treatment, recommended vaccination and linkage to HIV PrEP, HIV care, or other services as appropriate. Persons who are prescribed doxy PEP should undergo bacterial STI testing at anatomic sites of exposure at baseline and every 3–6 months thereafter. Ongoing need for doxy PEP should be assessed every 3–6 months as well. HIV screening should be performed for HIV-negative MSM and TGW according to current recommendations."
Also, For the past 25 years when I felt that my risk was unacceptable I used the "UN rape kit" , read page 17 of the attachment. This "kit" has change a lot over the years, in my early missions it was just Bactrim...
Forgot to mention that I use HIV Prep (on demand), but by now everyone should be fully aware of this kind of protection. But don't get it daily without having your kidney function assessed by a proper hospital.