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A temporary drop in potassium This is the most clinically recognised reason to feel worse early in treatment

It is not suitable for consumption by humans or animals

So the practical takeaway is not oral is better or SC is better. It is: pick one route, follow the documented per-dose figure for the vial you have, and keep the route constant so that whatever you observe is not confounded by a mid-stream route change

For those with deficiencies or certain health conditions that impede nutrient absorption from food sources alonesuch as pernicious anemia or gastrointestinal disordersa direct injection can be life-changing