What is the difference between Penicillin G Benzathin and Penicillin G Benzathine?

Penicillin G Benzathin and Penicillin G Benzathine are both Penicillin Antibiotics, so they work through the same broad mechanism. They differ in dosing, half-life, side-effect frequency, and how individual patients tolerate them. See the head-to-head sections below for the specifics.

Is Lentocilin the same as Bicillin L-A?

No. Lentocilin (Penicillin G Benzathin) and Bicillin L-A (Penicillin G Benzathine) are distinct medications. They are sometimes confused because of similar branding or because they treat overlapping conditions, but they have different active ingredients and different safety profiles.

Which has fewer side effects, Penicillin G Benzathin or Penicillin G Benzathine?

Side-effect frequency varies by individual. The side-effect comparison section on this page shows FAERS-reported events for each drug side by side. FAERS is voluntary reporting, so it reflects what patients and clinicians chose to report, not absolute population risk.

Can I switch from Penicillin G Benzathin to Penicillin G Benzathine?

Switching medications should always be done under prescriber supervision. The "patient stories" section on this page includes accounts from people who have made the switch and what their transition felt like, but those are individual experiences, not protocols.

Penicillin G Benzathin vs Penicillin G Benzathine

Compare Penicillin G Benzathin (Lentocilin) and Penicillin G Benzathine (Bicillin L-A), clinical data, side effects, and patient experiences.

Penicillin G Benzathin

Lentocilin · Penicillin Antibiotic

How it works

Other agent

Approved for

Lentocilin S is indicated for the treatment of the following infections in adults and children: - Upper respiratory tract infections

IntramuscularTablet

Penicillin G Benzathine

Bicillin L-A · Penicillin Antibiotic

How it works

Mechanism of Action Penicillin G exerts a bactericidal action against penicillin-susceptible microorganisms during the stage of active multiplication. It acts through the inhibitio...

Approved for

INDICATIONS AND USAGE To reduce the development of drug-resistant bacteria and maintain the effectiveness of Bicillin L-A and other antibacterial drugs

Bicillin L-A should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria. When culture and susceptibility information are available

they should be considered in selecting or modifying antibacterial therapy. In the absence of such data

yaws

IntramuscularTablet

Quick Comparison

Penicillin G BenzathinPenicillin G Benzathine

Drug Class

Penicillin Antibiotic

Route

Intramuscular

Half-Life

N/A

FDA Approved

N/A

Side Effect Frequency Comparison

Estimated frequency (%) based on clinical trial data

Side Effects

Penicillin G Benzathin

Drug Not Working

1-10%

Shortness of Breath

1-10%

Rash

1-10%

Diarrhea

1-10%

Nausea

0.1-1%

Anxiety

0.1-1%

Fatigue

0.1-1%

Headache

0.1-1%

Penicillin G Benzathine

Drug Not Working

1-10%

Shortness of Breath

1-10%

Rash

1-10%

Diarrhea

1-10%

Nausea

0.1-1%

Anxiety

0.1-1%

Fatigue

0.1-1%

Headache

0.1-1%

FDA Warnings

Penicillin G Benzathin

Serious hypersensitivity reactions (anaphylactic reactions), sometimes fatal, have been reported in patients on penicillin therapy
This microorganism produces toxins, which are responsible for diarrhea associated to antibiotherapy, which can range from mild diarrhea to fatal colitis
Because of the risk of neurotoxicity, caution is recommended especially in the case of administration of high doses of benzylpenicillin to renal impaired patients
The use of benzylpenicillin for more than 2 weeks may be associated with an increased risk of neutropenia and incidence of immune complex self-limited sickness-like reactions

Penicillin G Benzathine

WARNING NOT FOR INTRAVENOUS USE
THERE HAVE BEEN REPORTS OF INADVERTENT INTRAVENOUS ADMINISTRATION OF PENICILLIN G BENZATHINE WHICH HAS BEEN ASSOCIATED WITH CARDIORESPIRATORY ARREST AND DEATH
Prior to administration of this drug, carefully read the WARNINGS , ADVERSE REACTIONS, and DOSAGE AND ADMINISTRATION sections of the labeling
WARNING NOT FOR INTRAVENOUS USE

Clinical Trial Data

No head-to-head clinical studies found for Penicillin G Benzathin vs Penicillin G Benzathine.

Penicillin G Benzathin vs Penicillin G Benzathine: What You Should Know

Key Differences

Both Penicillin G Benzathin and Penicillin G Benzathine belong to the Penicillin Antibiotic class. While they share a similar mechanism of action, differences in pharmacokinetics, dosing, and side effect profiles may make one more suitable than the other for individual patients.

Safety Considerations

Penicillin G Benzathin carries 4 FDA warnings. Penicillin G Benzathine carries 4 FDA warnings. Patients should discuss all warnings and contraindications with their healthcare provider before starting or switching medications..

This comparison is for informational purposes only. Always consult a qualified healthcare professional before making medication decisions.

Related Comparisons

Ampicillin Sodium And Sulbactam Sodium vs Penicillin G Benzathine→Ampicillin Sodium vs Penicillin G Benzathine→Ampicillin vs Penicillin G Benzathine→Penicillin G Benzathine vs Penicillin G Potassium→Dicloxacillin Sodium vs Penicillin G Benzathine→Nafcillin vs Penicillin G Benzathine→

Primary sources

Every figure on this comparison links back to its primary source. See data sources and methodology for the full provenance trail.

Penicillin G Benzathin: DailyMed label · FAERS adverse events · ClinicalTrials.gov
Penicillin G Benzathine: DailyMed label · FAERS adverse events · ClinicalTrials.gov

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Penicillin G Benzathin vs Penicillin G Benzathine

Compare Penicillin G Benzathin (Lentocilin) and Penicillin G Benzathine (Bicillin L-A), clinical data, side effects, and patient experiences.

Penicillin G Benzathin

Lentocilin · Penicillin Antibiotic

How it works

Other agent

Approved for

Lentocilin S is indicated for the treatment of the following infections in adults and children: - Upper respiratory tract infections

IntramuscularTablet

Penicillin G Benzathine

Bicillin L-A · Penicillin Antibiotic

How it works

Mechanism of Action Penicillin G exerts a bactericidal action against penicillin-susceptible microorganisms during the stage of active multiplication. It acts through the inhibitio...

Approved for

INDICATIONS AND USAGE To reduce the development of drug-resistant bacteria and maintain the effectiveness of Bicillin L-A and other antibacterial drugs

Bicillin L-A should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria. When culture and susceptibility information are available

they should be considered in selecting or modifying antibacterial therapy. In the absence of such data

yaws

IntramuscularTablet

Quick Comparison

Penicillin G BenzathinPenicillin G Benzathine

Drug Class

Penicillin Antibiotic

Route

Intramuscular

Half-Life

N/A

FDA Approved

N/A

Side Effect Frequency Comparison

Estimated frequency (%) based on clinical trial data

Side Effects

Penicillin G Benzathin

Drug Not Working

1-10%

Shortness of Breath

1-10%

Rash

1-10%

Diarrhea

1-10%

Nausea

0.1-1%

Anxiety

0.1-1%

Fatigue

0.1-1%

Headache

0.1-1%

Penicillin G Benzathine

Drug Not Working

1-10%

Shortness of Breath

1-10%

Rash

1-10%

Diarrhea

1-10%

Nausea

0.1-1%

Anxiety

0.1-1%

Fatigue

0.1-1%

Headache

0.1-1%

FDA Warnings

Penicillin G Benzathin

Serious hypersensitivity reactions (anaphylactic reactions), sometimes fatal, have been reported in patients on penicillin therapy
This microorganism produces toxins, which are responsible for diarrhea associated to antibiotherapy, which can range from mild diarrhea to fatal colitis
Because of the risk of neurotoxicity, caution is recommended especially in the case of administration of high doses of benzylpenicillin to renal impaired patients
The use of benzylpenicillin for more than 2 weeks may be associated with an increased risk of neutropenia and incidence of immune complex self-limited sickness-like reactions

Penicillin G Benzathine

WARNING NOT FOR INTRAVENOUS USE
THERE HAVE BEEN REPORTS OF INADVERTENT INTRAVENOUS ADMINISTRATION OF PENICILLIN G BENZATHINE WHICH HAS BEEN ASSOCIATED WITH CARDIORESPIRATORY ARREST AND DEATH
Prior to administration of this drug, carefully read the WARNINGS , ADVERSE REACTIONS, and DOSAGE AND ADMINISTRATION sections of the labeling
WARNING NOT FOR INTRAVENOUS USE

Clinical Trial Data

No head-to-head clinical studies found for Penicillin G Benzathin vs Penicillin G Benzathine.

Penicillin G Benzathin vs Penicillin G Benzathine: What You Should Know

Key Differences

Safety Considerations

This comparison is for informational purposes only. Always consult a qualified healthcare professional before making medication decisions.

Primary sources

Every figure on this comparison links back to its primary source. See data sources and methodology for the full provenance trail.

Penicillin G Benzathin: DailyMed label · FAERS adverse events · ClinicalTrials.gov
Penicillin G Benzathine: DailyMed label · FAERS adverse events · ClinicalTrials.gov