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== Differences between Amoxicillin and Penicillin ==
Amoxicillin and penicillin are both beta-lactam antibiotics used to treat bacterial infections.<ref name="ref1" /> Amoxicillin is a derivative of penicillin and belongs to the aminopenicillin family of antibiotics.<ref name="ref2" /> It was developed by chemically modifying the original penicillin structure to improve its effectiveness.<ref name="ref3" /> Both drugs function by inhibiting the synthesis of bacterial cell walls, which leads to the death of the bacteria.<ref name="ref4" /> While they share a common mechanism, their structural differences result in distinct properties affecting their range of activity and clinical use.<ref name="ref1" />

=== Comparison table ===
{| class="wikitable"
|-
! Category !! Amoxicillin !! Penicillin (Penicillin V/G)
|-
| '''Antibiotic Spectrum''' || Broad-spectrum.<ref name="ref5" /> Effective against many gram-positive and some gram-negative bacteria such as ''H. influenzae'' and ''E. coli''.<ref name="ref2" /> || Narrow-spectrum.<ref name="ref5" /> Primarily effective against gram-positive bacteria like ''Streptococcus''.<ref name="ref5" />
|-
| '''Chemical Structure''' || A penicillin core with an added amino group and a hydroxyl group on its side chain.<ref name="ref1" /> || A natural or semi-synthetic antibiotic with a core penicillin structure.<ref name="ref3" />
|-
| '''Oral Absorption''' || Well-absorbed when taken orally, with bioavailability between 74% and 92%. Absorption is not significantly affected by food. || Penicillin V is acid-stable for oral use, but has variable bioavailability (25% to 60%). Penicillin G is largely destroyed by stomach acid and is typically given by injection.<ref name="ref3" />
|-
| '''Common Uses''' || Respiratory tract infections, ear infections, urinary tract infections (UTIs), and ''H. pylori'' eradication.<ref name="ref5" /> || Strep throat, dental infections, and rheumatic fever prophylaxis.<ref name="ref5" />
|-
| '''Year of Medical Use''' || 1972.<ref name="ref5" /> || Widespread use began during World War II, following its discovery in 1928.<ref name="ref5" />
|-
| '''Resistance''' || Can be rendered ineffective by beta-lactamase enzymes produced by some bacteria; often combined with clavulanic acid to overcome this.<ref name="ref5" /> || Susceptible to beta-lactamase enzymes.<ref name="ref2" />
|}

[[File:Venn_diagram_Differences_between_Amoxicillin_versus_Penicillin_comparison.png|thumb|center|800px|alt=Venn diagram for Differences between Amoxicillin and Penicillin|Venn diagram comparing Differences between Amoxicillin and Penicillin]]

=== Chemical structure ===
Amoxicillin is a semi-synthetic aminopenicillin.<ref name="ref2" /> Its structure is different from that of penicillin G due to the addition of a hydroxyl group on the phenyl side chain.<ref name="ref1" /> This modification increases the drug's ability to penetrate the outer membrane of some gram-negative bacteria, which expands its spectrum of activity.<ref name="ref1" />

=== Spectrum of activity ===
The structural differences between the two antibiotics directly impact the range of bacteria they can treat. Penicillin is considered a narrow-spectrum antibiotic, mainly targeting gram-positive bacteria.<ref name="ref5" /> Amoxicillin is a broad-spectrum antibiotic because it is effective against a wider range of bacteria, including gram-positive bacteria and some gram-negative bacteria such as ''Haemophilus influenzae'', ''Neisseria gonorrhoeae'', and certain strains of ''Escherichia coli''.<ref name="ref2" />

=== Pharmacokinetics ===
A significant difference between the two drugs is their behavior in the body. Amoxicillin is more stable in stomach acid and is absorbed more efficiently and consistently than penicillin V when taken orally. This results in higher concentrations of the drug in the blood. Penicillin V has much more variable oral absorption. Penicillin G is not acid-stable and is usually administered via injection to be effective.<ref name="ref3" />

== References ==
<references />

[[Category:Comparisons]]

Differences between Amoxicillin and Penicillin - Revision history

Dwg: Article written and Venn diagram created.