Comparative Pharmacology
Head-to-head clinical analysis: KEFLEX versus RESPORAL.
Peer-Reviewed Evidence
Head-to-head clinical analysis: KEFLEX versus RESPORAL.
KEFLEX vs RESPORAL
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Cephalexin is a first-generation cephalosporin antibiotic that inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), leading to cell lysis and death.
RESPORAL contains theophylline, a methylxanthine that inhibits phosphodiesterase (PDE) isoenzymes, leading to increased intracellular cAMP and cGMP levels. It also antagonizes adenosine receptors, resulting in bronchodilation and anti-inflammatory effects.
250-500 mg orally every 6 hours; maximum 4 g/day.
2 mg orally twice daily
None Documented
None Documented
0.5–1.2 hours in patients with normal renal function (CrCl >50 mL/min); prolonged to >20 hours in ESRD.
Terminal half-life is 12 hours (range 10-14 h), supporting twice-daily dosing in most patients.
Primarily renal (90% or more unchanged via glomerular filtration and tubular secretion); small amounts biliary/fecal (<5%).
Renal excretion accounts for 70% of elimination (30% unchanged), biliary/fecal 20%, and 10% metabolized.
Category C
Category C
Cephalosporin Antibiotic
Cephalosporin Antibiotic