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“Intramuscular injection of benzathine + procaine penicillin resulted in higher maximum concentration in plasma (Cmax) than did subcutaneous injection.”
Comparative biochemistry and physiology. Toxicology & pharmacology : CBP • 2008 | View Paper
“After treatment with products containing ampicillin trihydrate and procaine penicillin an unexpectedly long persistence of these drugs in the renal cortex was observed.”