Final answer:
Sustiva (efavirenz) is the antiretroviral drug that is not recommended for use in patients who are less than 8 weeks pregnant due to risks of neural tube defects.
Step-by-step explanation:
The antiretroviral drug that is no longer recommended in patients who are pursuing pregnancy or are <8 weeks pregnant due to potential neural tube defects is Sustiva (efavirenz).
While other drugs like Epivir (lamivudine) and Norvir (ritonavir) are used in the treatment of HIV, they are not associated with the same risks during early pregnancy. Tivicay (dolutegravir) might also have some considerations regarding use in the early stages of pregnancy but is not mentioned specifically in the provided context.