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Morphine has a bioavailability of about 30% because 70% is metabolized via 1st pass effect (metabolism by the liver) if taken orally
See the concentration and syringe draw for this vial
International Journal of Molecular Science
Patients self-injecting vitamin B12 without telling their GP, finds study A large proportion of patients with a vitamin B12 deficiency self-inject medication sourced online, citing difficulty with accessing treatment from GPs
What Is Cyanocobalamin Prescribed For
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