Please stay calm; there are highly effective ways to protect yourself. The medication you mentioned contains two drugs, zidovudine and lamivudine. While these are active against HIV, a two-drug combination alone is no longer considered the standard or most effective post-exposure prophylaxis (PEP) regimen. Current medical guidelines recommend a three-drug regimen for optimal protection. For PEP to be highly effective, it must be started within 72 hours of exposure and taken daily for 28 days. I strongly recommend visiting a clinic or emergency room immediately to get the complete, recommended three-drug regimen. Act quickly, as time is key, and healthcare providers are there to help you.