Acyclovir, a common antiviral medication, is known for its effectiveness against herpes simplex virus infections. While it primarily targets the virus itself, research suggests that acyclovir may have some impact on immune responses. Studies have shown that acyclovir can modulate immune functions, such as reducing the production of certain cytokines and affecting T cell responses [2]. This modulation of immune responses by acyclovir could potentially have implications for the overall immune system's ability to combat infections. However, the exact mechanisms and implications of acyclovir on immune responses may vary and require further investigation.

In conclusion, acyclovir may have some influence on immune responses, but the extent and specific effects are still being studied. It is essential to consult healthcare professionals for personalized advice on the use of acyclovir and its potential impact on immune function.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ACYCLOVIR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4414608/
[3] https://pubmed.ncbi.nlm.nih.gov/3183633/