Thank you for your query at DoctorSpring.com
I understand your concern.
I will like to know more details about your exposure just to understand the need of the Post Exposure Prophylaxis.
However if there has been a risky exposure, it is prudent to start the PEP, and it should not be delayed beyond 3 days. PEP is normally required for 28 days, and there will be minor gastric discomfort, loss of appetite and nausea, no long term complications. This kind of outweighs the risks of HIV infection itself, and so starting PEP is a smarter choice in case there is a need.
A combination of Zidovudine + Tenofovir/ Zidovudine ( AZT ) + Emtricitabine acts well and is the recommended choice. You can go for either.
You can take the PEP for 28 days, and get yourself tested at the end of 6 weeks. The latest 4th generation tests can 99 % rule out infection by the end of 1 month from exposure, still doctors like testing at the end of 6 weeks for conclusive evidence.
Feel free to discuss further,