The AAFP recommends injectable therapy when rapid improvement is needed for severe deficiency or serious neurologic involvement

Indicated Cases This formulation is most appropriate for: Kittens and small adult cats under 2.5 kg with FIP and confirmed or suspected anaemia Neurological FIP presentations in the small cat weight range Cats presenting with significant appetite loss or weight decline at diagnosis Cases where the owner or attending veterinarian wishes to consolidate antiviral and nutritional support into a single daily injection Cats with a history of B12-responsive conditions alongside a new FIP diagnosis This Formulation Is Not the First Choice For Cats requiring therapeutic-dose B12 supplementation independently maintain a separate B12 protocol as directed Cats over 2.5 kg consider the 30mg/ml + B12 or 40mg/ml + B12 formulations Cases where the veterinarian has specifically indicated the non-B12 formulation Concentration Selection Guide Administration Administer subcutaneously once daily

A natural, long-acting form of B12, hydroxycobalamin is popular in Europe and is often used to treat deficiencies and pernicious anaemia
In men, HCG is employed to stimulate testosterone production and spermatogenesis in hypogonadotropic hypogonadism (secondary hypogonadism due to pituitary deficiency)
Jumping from 0.25 mg to 1.0 mg because you are "not feeling anything" is a reliable way to spend the next week unable to keep food down
The most commonly reported side effects in clinical trials include: Nausea Vomiting Diarrhea Constipation Most of these symptoms were mild to moderate and tended to improve over time as the body adjusted to the medication, especially when doses were increased gradually