Are all Erythromycin tablets enteric coated?

The brand name Flagyl, which is non-generic Metronidazole, does offer an enteric coated option. Since I have used this medication more than on one occasion to treat giardiasis, I understand the severity of nausea that normally accompanies it's use as a side effect. While not entirely mitigating these symptoms, the enteric version does reduce them to a more tolerable level and make it more likely that patients will take their medication on time and to completion. For giardiasis, the enteric version of Flagyl should be the default prescription.