Seek urgent medical attention (contact 999, NHS 111, or attend A&E) if you experience: Black, tarry stools (melaena) may indicate upper gastrointestinal bleeding Bright red blood in or on stools, particularly if accompanied by dizziness, weakness, or rapid heartbeat Pale or clay-coloured stools with yellowing of skin or eyes (jaundice) potential biliary obstruction or liver dysfunction Severe abdominal pain with stool changes, especially if persistent or worsening Stop your GLP-1 medication and seek urgent medical assessment if you develop symptoms suggestive of pancreatitis (severe, persistent abdominal pain which may radiate to your back, with or without vomiting)

The same analysis also found that "Hiccups were reported in 2% of patients during the clinical trial phase." Gastrointestinal adverse events associated with semaglutide: A pharmacovigilance study based on FDA adverse event reporting system, showing the phenomenon appears, albeit infrequently, under controlled conditions as well
Overweight women using Zepbound who are also using oral forms of contraceptives are advised to consider using a barrier method of contraception, like a condom, or changing to a non-oral contraceptive
Bottom line: Its almost impossible to become toxic on vitamin B12 unless you have kidney issues