Ampicillin sodium

10–20 mg/kg, SC, IM, or IV, q 6–8 h; or 20–40 mg/kg, PO, q 8 h

Ceftiofur sodium

3–5 mg/kg, IM, q 24 h, for 3 d (long-acting formulation: 5 mg/kg, IM, q 3–5 d)

Actinobacillus

No more than 2 mL per injection site

Gentamicin

5 mg/kg, PO, q 24 h; or 10–15 mg/kg, SC or IM, q 24 h

Colibacillosis and swine dysentery

Lincomycin

10–11 mg/kg, IM, q 24 h

Mycoplasma

Oxytetracycline

7–11 mg/kg, IM, q 24 h; or 44–55 mg/kg, PO, q 24 h (long-acting formulation: 1.4–2.3 mg/kg, IM, q 24 h, for maximum 4 d)

Penicillin G, procaine

20,000–60,000 U/kg, IM, q 24 h

Tetracycline

10–20 mg/kg, IM, q 24 h (long-acting formulation: 10–20 mg/kg, IM, q 48 h)

Enteritis, pneumonia

Trimethoprim-sulfa

15 mg/kg, PO, q 12 h; or 30 mg/kg, PO, q 24 h