Amoxicillin vs. Clindamycin

See how Amoxicillin and Clindamycin compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Amoxicillin is a first-choice penicillin antibiotic for common infections like ear, sinus, and urinary tract infections.

  • Clindamycin is typically reserved for penicillin-allergic patients or infections caused by bacteria amoxicillin cannot reach.

  • Both drugs carry a risk of C. difficile-related diarrhea, but clindamycin carries a boxed warning for this risk.

Amoxicillin vs. Clindamycin Drug Summary

Amoxicillin

Amoxicillin is a penicillin-class antibiotic used to treat infections of the ear, throat, sinuses, lungs, skin, and urinary tract. It is taken by mouth as a capsule, tablet, chewable, or liquid, usually two or three times a day.

Clindamycin

Clindamycin is a lincosamide antibiotic used for serious bacterial infections, including those caused by anaerobic bacteria that amoxicillin cannot treat. It comes as an oral capsule, IV injection, or topical and vaginal formulations, typically dosed every 6 to 8 hours.

Amoxicillin vs. Clindamycin Side Effects

Amoxicillin

Most common
vomiting (greater than 1%)
nausea (greater than 1%)
diarrhea (greater than 1%)
rash (greater than 1%)

Clindamycin

Most common
vomiting (common)
nausea (common)
diarrhea (common)
abdominal pain (common)

Amoxicillin vs. Clindamycin Dosage

Amoxicillin

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 250 mg every 8 hours At the start
Maximum dose 1 g three times daily If needed
Dose changes 4 increases As tolerated

Clindamycin

Dosage
Dosage Table
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

Amoxicillin vs. Clindamycin Indications

Amoxicillin

Amoxicillin is FDA-approved for common bacterial infections such as ear, nose, and throat infections, lower respiratory infections, urinary tract infections, and certain skin infections. It is also used alongside other drugs to treat H. pylori and uncomplicated gonorrhea.

  • Ear, nose, and throat infections

  • Lower respiratory tract infections

  • Skin and skin structure infections

  • Urinary tract infections

  • H. pylori eradication (combination therapy)

Clindamycin

Clindamycin is FDA-approved for serious infections caused by anaerobic bacteria and certain strains of streptococci, staphylococci, and pneumococci. It also treats gynecological, intra-abdominal, bone, joint, and bloodstream infections, plus acne and bacterial vaginosis in topical or vaginal form.

  • Serious anaerobic bacterial infections

  • Lower respiratory tract infections

  • Skin and skin structure infections

  • Bone and joint infections

  • Acne vulgaris (topical) and bacterial vaginosis (vaginal)

Amoxicillin vs. Clindamycin Pros and Cons

Amoxicillin

Amoxicillin is a well-tolerated, inexpensive first-line antibiotic with decades of safety data. It does not carry a boxed warning, but it cannot be used in patients with penicillin allergies and has limited activity against many anaerobic bacteria.

Pros

  • No boxed warning for serious colitis

  • Generally milder, less frequent GI side effects

  • Available as a chewable tablet and liquid for children

Cons

  • Cannot be used in patients with penicillin allergy

  • Weaker coverage of anaerobic bacteria

  • Higher risk of rash if given during mononucleosis

Clindamycin

Clindamycin covers bacteria that amoxicillin cannot reach and is a key option for patients allergic to penicillins. It carries a boxed warning for C. difficile-associated colitis and is generally reserved for more serious infections.

Pros

  • Safe option for patients with penicillin allergy

  • Effective against anaerobic bacteria amoxicillin misses

  • Available in oral, IV, topical, and vaginal forms

Cons

  • Boxed warning for severe, potentially fatal colitis

  • Oral capsules can cause esophagitis if not taken with fluids

  • No meaningful penetration into the central nervous system

Common Symptoms and Related Diseases You Can Explore

Explore a range of common symptoms the Doctronic Symptom Checker can help you understand.