No black box warning on record for N-20
As of the latest FDA labeling reviewed, N-20 (STRYCHNOS NUX-VOMICA SEED, ARSENIC TRIOXIDE, ACTIVATED CHARCOAL, SILVER NITRATE, MARSDENIA CUNDURANGO WHOLE, TRIPE, AND SUS SCROFA DUODENUM) does not carry a black box warning. Standard warnings and precautions still apply — see the full N-20 medicine page for the complete safety profile.