Clindamycin vs. Cephalexin
See how Clindamycin and Cephalexin compare on approved uses, dosing, side effects, and cost.
Key Takeaways
Clindamycin is often chosen for serious infections and as an alternative for patients with penicillin allergies, but it carries a boxed warning for C. difficile-associated colitis.
Cephalexin is a first-generation cephalosporin used for common outpatient infections like strep throat, ear infections, and UTIs, and it generally causes fewer GI side effects than clindamycin.
Clindamycin comes in oral, IV, topical, and vaginal forms, while cephalexin is available only as an oral capsule, tablet, or liquid suspension.
Clindamycin vs. Cephalexin Drug Summary
Clindamycin
Clindamycin is a lincosamide antibiotic used for serious infections caused by anaerobic bacteria, streptococci, staphylococci, and pneumococci. It comes in oral capsules, IV/IM injection, and topical or vaginal forms, and is often chosen for patients allergic to penicillin.
Cephalexin
Cephalexin is a first-generation cephalosporin antibiotic used for common infections like strep throat, ear infections, skin infections, and UTIs. It is taken orally as a capsule, tablet, or liquid suspension, usually every 6 to 12 hours.
Clindamycin vs. Cephalexin Side Effects
Clindamycin
Cephalexin
Clindamycin vs. Cephalexin Dosage
Clindamycin
Cephalexin
| STAGE | DOSE | WHEN |
| Starting dose | 150 mg every 6 hours | At the start |
| Maximum dose | up to 4800 mg/day IV | If needed |
| Dose changes | 6 increases | As tolerated |
| STAGE | DOSE | WHEN |
| Starting dose | 25-50 mg/kg/day divided | At the start |
| Maximum dose | 1 to 4 g/day divided | If needed |
| Dose changes | 4 increases | As tolerated |
Clindamycin
| STAGE | DOSE | WHEN |
| Starting dose | 150 mg every 6 hours | At the start |
| Maximum dose | up to 4800 mg/day IV | If needed |
| Dose changes | 6 increases | As tolerated |
Cephalexin
| STAGE | DOSE | WHEN |
| Starting dose | 25-50 mg/kg/day divided | At the start |
| Maximum dose | 1 to 4 g/day divided | If needed |
| Dose changes | 4 increases | As tolerated |
Clindamycin vs. Cephalexin Indications
Clindamycin
Clindamycin is FDA-approved for serious infections caused by susceptible anaerobic bacteria, as well as certain streptococcal, staphylococcal, and pneumococcal infections. It is used for lower respiratory, skin, bone, joint, and gynecological infections, and topical or vaginal forms treat acne and bacterial vaginosis. It is not effective for viral infections or most upper respiratory infections.
Serious anaerobic bacterial infections
Skin and skin structure infections
Bone and joint infections
Gynecological infections
Acne vulgaris (topical form)
Cephalexin
Cephalexin is FDA-approved for respiratory tract infections, ear infections, skin infections, bone infections, and genitourinary infections caused by susceptible bacteria. It is commonly prescribed for strep throat, otitis media, and uncomplicated UTIs in outpatient settings. It is not effective against anaerobic bacteria or viral illnesses.
Respiratory tract infections
Otitis media (ear infections)
Skin and skin structure infections
Bone infections
Genitourinary tract infections
Clindamycin vs. Cephalexin Pros and Cons
Clindamycin
Clindamycin is a versatile antibiotic available in oral, IV, topical, and vaginal forms, making it useful across many infection types. It's often selected for patients with penicillin allergies but carries a boxed warning for C. difficile colitis, so it's typically reserved for infections where other options aren't suitable.
Pros
Effective against anaerobic bacteria
Preferred option for penicillin allergy
Available in oral, IV, topical, and vaginal forms
Reaches bone and joint tissue well
Cons
Boxed warning for C. diff colitis
Requires dosing every 6 hours orally
Must be taken with plenty of water
Higher reported rates of GI side effects
Cephalexin
Cephalexin is a well-established, generic-only antibiotic widely used for common outpatient infections like strep throat and UTIs. It generally causes fewer GI disturbances than clindamycin, but cross-reactivity concerns exist for patients with cephalosporin or penicillin allergies.
Pros
Only available as low-cost generic
Simple twice-daily adult dosing
Long history of use for common infections
Generally fewer GI side effects reported
Cons
Cross-reactivity risk with penicillin allergy
Not effective against anaerobic bacteria
Dose adjustment needed in kidney impairment
Not used for serious systemic infections
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