| 0.8 - 2 ng/mL | |
| Acyclovir, or Valacyclovir | |
| Sulfamethoxazole: interferes with bacterial folic acid synthesis from para-aminobenzoic acid trimethoprim: inhibits dihydrofolic acid reduction to tetrahydrofolate | |
| Decreased salt intake, NSAIDS, ACE-I, ARBs, dehydration |