Can you take a z pack while taking Tamiflu?

Yes. According to the Tamiflu prescription information:

TAMIFLU has been shown to have a minimal chance of negatively interacting with other medications. Over-the-counter medications may be prescribed to reduce severity of symptoms while the antiviral action of TAMIFLU takes effect.

Antibiotics and Tamiflu should be OK taken together, however, depending on the reason for the antibiotic, you may want to get counseling from the Pharmacist or your doctor before using both.

Remember that Tamiflu is an antiviral and is for treating viral infections, not for treating bacterial infections. Antibiotics, like Z-pack are made for treating bacterial infections.