Any process that stops, prevents or reduces the frequency, rate or extent of tetrapyrrole metabolic process.
Synonyms:
exact_synonym:
down regulation of tetrapyrrole metabolic process; down regulation of tetrapyrrole metabolism; downregulation of tetrapyrrole metabolic process; downregulation of tetrapyrrole metabolism; inhibition of tetrapyrrole metabolism; negative regulation of tetrapyrrole metabolism