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Pisacilina

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Pisacilina

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Medically reviewed

Laura Arias

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

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Overview of Pisacilina

Pisacilina is the defined trade name for the active substance Benzylpenicillin, a highly effective antibiotic used in the treatment of systemic bacterial infections. This section details its identity, composition, and general therapeutic purpose.


Quick Facts

Property Description
Active ingredient Benzylpenicillin (Penicillin G)
Form Sterile powder for solution for injection
Pharmacological class beta-Lactam Antibiotic (Natural Penicillin)
Common purpose Eradication of systemic bacterial infections
Origin Natural (Biosynthetic)

What Type of Antibiotic is Pisacilina (Benzylpenicillin)?

Pisacilina is classified as a beta-lactam antibiotic and one of the original natural penicillins, designated strictly as a Prescription-Only Medicine (Rx status). This classification reflects the drug's core function as a potent bactericidal agent. Benzylpenicillin is clinically recognized for its rapid action against a narrow spectrum of susceptible bacterial species. Its necessity in acute care is further recognized by its status as an essential medicine.


Composition and Origin: Is Pisacilina a Natural Medicine?

Yes, Pisacilina is a single-ingredient drug containing Benzylpenicillin, which is derived from biosynthetic sources, placing it in the natural penicillin family. The medicine is prepared as a sterile powder for solution for injection, a form that highlights its intended use in settings requiring immediate, high-concentration systemic delivery. The use of this specialized form, rather than an oral preparation, is required because of the substance's instability in stomach acid, necessitating parenteral administration. The active ingredient is typically formulated as the potassium or sodium salt.


How Does Pisacilina Work to Eliminate Pathogens?

The core function of Pisacilina is to directly destroy susceptible bacteria by interfering with the synthesis of their cell wall. As a bactericidal agent, it prevents the bacteria from constructing the structural components necessary for survival, leading to their immediate cellular destruction. This focused mechanism explains why Pisacilina is commonly employed in situations like treating severe streptococcal infections, where the swift eradication of the pathogen is critical.

Regulatory References

  1. WHO Essential Medicines List
  2. Model List of Essential Medicines
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What side effects are possible with Pisacilina?

Possible Side Effects and Safety Information

The safety profile of Pisacilina (Benzylpenicillin) is primarily characterized by the risk of hypersensitivity reactions and, with high doses, Central Nervous System (CNS) toxicity, based on regulatory documents from agencies like the FDA and EMA.

Documented Adverse Reactions and Frequency

Hypersensitivity reactions, such as rashes and fever, are classified as Common (affecting 1 to 10% of treated patients). Anaphylactic reactions, which are life-threatening, are classified as Rare (0.01% to 0.1%). In patients treated for specific spirochetal infections, the Jarisch-Herxheimer reaction is documented as Very Common (over 10%).

Adverse effects are documented across several systems, including Blood and Lymphatic System Disorders (e.g., haemolytic anaemia, granulocytopenia) and Nervous System Disorders (e.g., convulsions). Effects such as Interstitial nephritis (renal) and Pseudomembranous colitis (gastrointestinal) are also noted.

Serious Safety Considerations

Serious adverse reactions include Anaphylaxis, CNS toxicity (convulsions/seizures), and Severe Cutaneous Adverse Reactions (SCARs) like Stevens-Johnson syndrome (SJS) and Toxic Epidermal Necrolysis (TEN). The risk of CNS toxicity is significantly increased in patients with impaired renal function due to delayed drug excretion. Prolonged use may lead to the overgrowth of non-susceptible organisms (superinfections).

The medicine is strictly contraindicated in individuals with a history of hypersensitivity to penicillin or any other beta-lactam agent. Specific safety constraints also exist regarding concomitant use, such as reduced efficacy of oral contraceptives and increased methotrexate toxicity due to reduced clearance.

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Overdose and Emergency Response

Overdose and when to seek help

Overdosage of Pisacilina (Benzylpenicillin) is officially documented in regulatory labeling to primarily involve the Central Nervous System (CNS). The documented clinical manifestations include neuromuscular hyperirritability and generalized convulsive seizures, which may escalate to coma. Other signs of cerebral irritation such as confusion, tremors, and hallucinations are also noted. Massive doses may also cause severe physiological changes, notably hypokalaemia (low potassium) and hypernatraemia (high sodium).

When Immediate Medical Help is Required

Regulatory authorities state that immediate medical attention must be sought for any occurrence of convulsive seizures, coma, or signs of severe vascular compromise (e.g., gangrene) at or near the injection site. These are classified as life-threatening outcomes.

Overdose Management and Specific Risks

Treatment for overdose is defined as symptomatic and supportive, as no specific antidote is known. Procedures such as haemodialysis are documented as an option to assist in drug clearance for cases of severe systemic accumulation.

A critical population-specific constraint is the increased risk of severe CNS toxicity in patients with impaired renal function. This is due to reduced drug clearance, which causes high serum concentrations and subsequent cerebral irritation. Monitoring of electrolyte balance and renal function is advised in high-dose scenarios.

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Therapeutic Uses of Pisacilina

What Pisacilina Treats: Main Uses and Benefits

Pisacilina (Benzylpenicillin) is used for the treatment of certain serious bacterial infections. This medicine is commonly used in managing conditions characterized by periods of heightened symptoms where manifestations are related to systemic infections, deep-tissue complications, or specific spirochetal diseases.

It is applied in clinical settings that involve acute or unstable symptom patterns associated with conditions like septicaemia and bacterial meningitis, as well as severe localized issues such as osteomyelitis and gas gangrene. Additionally, it is a key therapeutic agent in addressing infections caused by Spirochetes (e.g., Syphilis) and in secondary prophylaxis to reduce the risk of recurring rheumatic fever.

This intervention supports the patient during acute phases by addressing symptom clusters of high fevers, chills, pain, and profound weakness. Its use may assist in limiting the progression of symptoms and related physiological strain, which contributes to easing the overall symptom load and supports general well-being during symptomatic phases.


Quick Fact: Support for Acute Systemic Symptoms
Supports the patient by addressing symptoms related to systemic imbalance, specifically high fevers and chills, during acute infection episodes.
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Eligibility and Restrictions for Use

Pisacilina, a penicillin-class antibiotic, is prescribed to treat various bacterial infections that are caused by microorganisms susceptible to its action. This commonly includes infections of the upper respiratory tract, skin, ear, throat, and certain dental and urinary tract infections. It is important to note that Pisacilina is ineffective against viral infections such as the common cold or flu.

Most individuals can safely use Pisacilina when it is properly prescribed. However, it is strictly contraindicated for patients who have a documented history of a serious allergic or hypersensitivity reaction to Pisacilina, any other penicillin-class antibiotic, or any beta-lactam antibiotic with a similar chemical structure, such as certain cephalosporins. Such reactions can range from skin rashes to severe, life-threatening anaphylaxis.

Special Considerations

Patient Group Guidance for Use
History of Allergy Do not use if allergic to penicillins or related beta-lactam antibiotics.
Kidney Impairment May require dose adjustment as the drug is primarily cleared by the kidneys.
Pregnancy/Breastfeeding Generally considered low-risk, but a physician must assess the benefit against the potential risk.

Patients with a history of severe diarrhea associated with antibiotic use or a known blood clotting disorder should also discuss these conditions with their healthcare provider before starting treatment.

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What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Pisacilina (Benzylpenicillin) details interactions governed primarily by the drug’s rapid renal elimination pathway and its resulting effect on co-administered substances. These documented interactions establish specific administration and exposure constraints.

Interacting Substance/Class Official Interaction Statement Classification Basis
Probenecid Increases Pisacilina serum concentrations and prolongs its elimination by inhibiting renal tubular secretion via Organic Anion Transporters (OATs). Pharmacokinetic
Methotrexate Pisacilina reduces the clearance of Methotrexate, resulting in an increased risk of exposure and toxicity of the co-administered drug. Pharmacokinetic / Restriction
Aminoglycosides Co-administration is prohibited when physically mixed in the same intravenous solution or line due to chemical inactivation. Procedural Restriction
Oral Anticoagulants Pisacilina may increase the anticoagulant activities of agents such as Warfarin or Acenocoumarol. Pharmacodynamic
Tetracycline Derivatives Co-administration may diminish the therapeutic effect of Pisacilina due to documented antagonism. Pharmacodynamic

Pisacilina's rapid excretion makes it susceptible to competitive inhibition by other weak organic acids, including certain high-dose Non-Steroidal Anti-Inflammatory Drugs (NSAIDs), which can reduce its excretion rate. Additionally, the sodium content of the sodium salt formulation requires explicit accounting for patients adhering to a sodium-restricted diet. These interactions, which hinge on renal clearance, are noted in regulatory documents to carry increased clinical significance in populations with renal impairment.

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Mechanism of Action

Molecular Mechanism: Irreversible Enzyme Inactivation

Pisacilina acts at a fundamental level by targeting and permanently disabling Penicillin-Binding Proteins ( PBPs) —enzymes vital for building the bacterial cell wall. The drug’s beta-lactam structure forms a covalent and irreversible bond with these enzymes, resulting in the inhibition of the cell wall construction process at the final cross-linking stage.

Causal Cascade: Cell Wall Breakdown and Lysis

The structural failure resulting from enzyme inhibition initiates the mechanistic sequence leading to cell lysis. Without the rigid peptidoglycan layer to maintain cellular integrity, the bacteria are susceptible to osmotic pressure from the external environment. This leads to the rapid influx of water, causing the bacterial cell membrane to rupture and resulting in cellular lysis and subsequent destruction of the pathogen.

️ Functional Constraints of the Mechanism

The mechanism is dependent on the target's activity; binding affinity is highest in actively dividing bacteria as it targets the process of cell wall synthesis. Furthermore, the mechanism can be overridden by bacterial defense strategies, such as the production of beta-lactamase enzymes, which hydrolyze the beta-lactam ring, inactivating the drug before it can reach its target PBPs.

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Dosage and Administration Information

How Pisacilina is Used

Pisacilina (Benzylpenicillin) is administered strictly following official guidelines, which are focused on precise delivery and fixed scheduling. The primary administration routes are Intravenous (IV) injection or infusion and Intramuscular (IM) injection. Due to the drug's instability in stomach acid, an oral route is not typically used for systemic infections. Specialized routes, such as Intrathecal administration, are reserved for specific severe conditions like meningitis.

Administration requires the use of a sterile powder that must be freshly reconstituted with a specified diluent, such as Water for Injections or Saline, immediately before use. High IV doses, often exceeding 1.2 g (2 Million Units), must be administered slowly to comply with administration constraints.

Dosing schedules involve administering the dose multiple times daily, typically every 4 to 6 hours, or via continuous infusion to ensure necessary concentrations are maintained in the bloodstream. The total duration of treatment is strictly defined by the condition being addressed, ranging from short courses (e.g., 7 days) to prolonged courses lasting several weeks.

Specific dosage modifications are mandated for certain patient populations. For instance, the frequency and dose must be reduced for patients with renal impairment or for neonates and premature infants, reflecting their slower ability to clear the medicine from the body. If a scheduled dose is missed, official instructions mandate that the patient skip that dose if the next one is imminent, and then resume the regular schedule; double doses are not permitted.

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Recent Clinical Evidence

Research evidence / Overview of studies for Pisacilina

The research on Pisacilina (Benzylpenicillin) provides an established base of information regarding its clinical evaluation. As an established medicine, its evidence often comes from a combination of high-level reviews that summarize historical clinical observation, alongside trials that included comparator treatments. This summary details what the scientific research has explored and where questions regarding its use still exist, according to regulatory and scientific literature.


Evidence for Acute, Systemic Bacterial Infections

Research has primarily focused on the critical outcomes for conditions categorized as acute and severe, such as septicaemia and bacterial meningitis. Studies exploring the use of Pisacilina in these settings include high-quality Systematic Reviews that consolidate findings over time. Researchers were primarily focused on outcomes related to overall patient survival (mortality) and the time to documented pathogen clearance.

Modern research involves Non-inferiority or Equivalence Trials where Pisacilina was evaluated against alternative standard treatments. These studies examined outcomes observed with Pisacilina relative to the comparator and tracked neurological status in patients with meningitis. What remains less characterized is the outcome of new, large-scale trials designed to evaluate whether Pisacilina is superior to all modern comparator treatments.


Evidence for Specific Deep-Tissue and Spirochetal Infections

Research for specific infections like syphilis (caused by Spirochetes) and severe localized conditions such as osteomyelitis often requires extended observation. The evidence base includes Randomized Controlled Trials and long-term Observational Cohort Studies.

Outcomes that were closely monitored included microbiological clearance of the pathogen and the status of relapse-free survival. Data remains insufficient for research focusing on comparative outcomes for patients with complex underlying comorbidities. Because the core evidence relies heavily on trials from the past, the data may not fully reflect contemporary clinical pictures.


Evidence Gaps and Areas of Uncertainty

Certain research limitations have been identified in scientific reviews. For instance, recent comparative evidence is lacking for certain types of life-threatening infections, where ethical constraints limit the ability to conduct large-scale superiority trials against newer antibiotics. Furthermore, there are identified gaps regarding the long-term status of patients beyond the defined follow-up of the initial trials, as long-term effects are not fully established.

Key Studies & References WHO Model Lists of Essential Medicines 23rd list (2023)

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Frequently Asked Questions (FAQ)

Common questions about Pisacilina (FAQ)


Q: What is Pisacilina actually used for?

Pisacilina (which is the medication Benzylpenicillin) is classified as an antibacterial drug. Official regulatory documents indicate that it is approved for the treatment of certain serious bacterial infections, which include conditions like pneumonia, meningitis, and syphilis.


Q: Is Pisacilina an antibiotic or something else?

Yes, Pisacilina is officially an antibacterial drug. It is classified by the FDA and other regulatory agencies as belonging to the Penicillin-class of medicines, which are used to treat bacterial infections.


Q: Can Pisacilina be used by children?

Official documents confirm its use in children, though dosage adjustments are often necessary. The medication is advised to be used with caution in newborns and premature infants due to the potential for slower clearance from the body.


Q: How is the efficacy of Pisacilina measured in research?

Studies and official product information indicate that the efficacy, or effectiveness, of Pisacilina is generally evaluated by measuring specific patient outcomes. These outcomes include overall patient survival rates and the time it takes for the specific pathogen to be cleared from the body.


Q: Why do some people report feeling nauseous after taking Pisacilina?

The regulatory label indicates that gastrointestinal disturbances are documented. Nausea, vomiting, and diarrhea are listed among the possible adverse effects that have been reported in some individuals using Pisacilina.


Q: What kind of research has been done on Pisacilina?

Research on this medication is typically extensive. The evidence base cited in official documents includes high-quality Systematic Reviews, equivalence trials (comparing it to other treatments), and long-term Observational Cohort Studies focusing on microbiological clearance.


Q: Why is Pisacilina only available by prescription?

Pisacilina is classified in regulatory frameworks as a prescription-only medicine (e.g., Schedule 4). This scheduling means that the drug requires oversight from a healthcare professional for safe and effective use.


Q: Is it normal to feel slightly dizzy when starting Pisacilina?

Regulatory documents list effects like dizziness or lightheadedness among the possible adverse reactions. As these effects have the potential to impact a person’s ability to perform tasks requiring focus, caution is generally advised.


Q: Can Pisacilina affect my sleep patterns?

Official information regarding documented side effects includes sleepiness or unusual drowsiness. This is related to the drug's possible effects on the Central Nervous System (CNS).


Q: Is Pisacilina considered a controlled substance?

Pisacilina is classified as a prescription medicine but is generally not listed as a controlled substance under the regulatory schedules in the US or similar international schedules.


Q: Are there any specific foods that must be avoided while using Pisacilina?

Regulatory documents indicate that there is no sufficient scientific evidence regarding the need to avoid any specific food while using Pisacilina. This medication's interaction information primarily addresses other medicines and substances.


Q: Is Pisacilina safe to take if I am over 65?

Clinical data suggests the medication is generally well-tolerated in older adults. However, official information notes that dose adjustments may be needed because older patients can experience slower clearance of the drug due to potential changes in kidney function.


Q: Can men and women use Pisacilina for the same conditions?

The official regulatory documents define the approved uses based on the specific condition being treated. No documented restrictions related to the patient's gender are noted for the treatment of these approved indications.


Q: How long does Pisacilina stay in your system after stopping treatment?

The drug is primarily eliminated from the body via the urine without significant chemical change. Regulatory information notes that elimination may be delayed in patients who have reduced kidney function.


Q: Is Pisacilina related to penicillin?

Yes. Pisacilina is the medication Benzylpenicillin, which is widely known as Penicillin G. It is a member of the foundational penicillin class of antibacterial drugs.


Q: What does the FDA classification of Pisacilina mean for patients?

The FDA classification indicates that the agency has reviewed the evidence and determined the medication to be safe and effective for its specifically approved uses when taken as prescribed.


Q: Can I drive while taking Pisacilina?

Side effects associated with Pisacilina, such as dizziness, confusion, or other Central Nervous System (CNS) effects, are documented in official warnings. These symptoms have the potential to impair attention and motor skills.


Q: What should I do if my side effects don't go away after a week on Pisacilina?

If adverse effects do not resolve or if symptoms of a severe reaction occur (such as a severe rash or difficulty breathing), it is advised to seek medical attention.


Q: Does Pisacilina have a different effect in younger adults versus older adults?

Clinical experience reported in regulatory documents has not identified differences in effect between younger and older adults. However, dose adjustments are a possibility for older patients due to changes in kidney function.


Q: Can I take other cold and flu medicines while using Pisacilina?

Official product information notes an interaction with certain drug classes, such as Non-Steroidal Anti-Inflammatory Drugs (NSAIDs). As NSAIDs are often included in cold and flu medicines, this potential interaction should be discussed with a healthcare provider.


Q: What is the purpose of the Pisacilina patient information leaflet?

The patient information leaflet is a formal regulatory document designed to ensure patient safety and effective use. It describes the medication's approved properties, indications, and the conditions necessary for its safe and effective administration.


Q: Does Pisacilina treat the cause or just the symptoms?

The drug’s action targets the cause of the infection. It works by inhibiting the final stage of the bacterial cell wall construction, which leads to the cellular destruction and clearance of the pathogen.


Q: What kind of results did the major Pisacilina studies show?

Major studies focused on critical outcomes. Results documented by official sources showed outcomes related to overall patient survival, the time it took for the specific pathogen to be cleared, and the status of relapse-free survival in specific infections.


Q: Is there a link between Pisacilina and mental health changes?

Official documents list Central Nervous System (CNS) adverse effects. These effects have been reported to include changes such as anxiety, confusion, and agitation, and, in rare instances, euphoria.


Q: What happens if Pisacilina is taken with alcohol?

Regulatory guidance suggests that alcohol consumption is generally advised against as it may worsen the effects of the underlying disease condition being treated. However, while studies suggest it does not significantly impact the absorption or efficacy of the drug itself, caution is generally advised.


Q: Is Pisacilina safe to use during pregnancy? (Descriptive information only)

Regulatory documents classify the drug in a category (e.g., TGA Category A) that suggests the risk of fetal harm is unlikely based on extensive data. However, regulatory guidance indicates that its use during pregnancy is reserved for cases where there is a clear need, as determined by a prescriber.


Q: What is the difference between how Pisacilina is described in the US versus Europe?

Pisacilina is the medication Benzylpenicillin. While many international documents (such as those in Europe) use this name, in the United States, the drug is most commonly referred to as Penicillin G.


Q: Why do doctors prescribe Pisacilina for so many different conditions?

Pisacilina is approved for use in a range of conditions because official data confirms its documented activity against several different types of susceptible bacteria. This broad activity makes it suitable for treating numerous bacterial infections.


Q: Does Pisacilina lose effectiveness over time?

The effectiveness of the medication can be diminished if the target bacteria develop resistance. This often happens through bacteria producing enzymes that counteract the drug's action.


Q: Can I take Pisacilina if I have diabetes?

Official safety warnings note that delayed absorption from the intramuscular (IM) injection site has been observed in individuals with diabetes. This is a factor requiring clinical oversight during the administration of the drug.


Q: Is Pisacilina known to cause joint pain?

Regulatory and medical sources list joint swelling or joint pain among the possible side effects of the medication. Any such pain should be reported to a healthcare provider.


Q: Does Pisacilina contain any common allergens like gluten or lactose?

The product formulation includes excipients (inactive ingredients). Official warnings state that patients with known allergies to certain substances, including specific inactive ingredients, must be excluded from treatment if those substances are present in the excipients.

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How should Pisacilina be stored and disposed of?

How to Store and Dispose of Pisacilina?

Regulatory guidelines define specific storage requirements for different forms of amoxicillin (Pisacilina).

Tablets, Capsules, and Dry Powder

  • Storage Temperature: Store at controlled room temperature (20 C to 25 C), protecting the medication from excessive heat.
  • Protection: Keep the medication in its original container and protect it from moisture.

Reconstituted Oral Suspension

  • Storage Temperature: Store in a refrigerator (2 C to 8 C). Do not freeze the liquid suspension.
  • Stability: The suspension must be discarded after 14 days (or 10 days, depending on the official label).

General Disposal and Handling

All forms of the medicine must be kept out of the reach of children. Unused or expired medication should be disposed of by following local and federal guidelines, such as utilizing drug take-back programs, to prevent accidental ingestion or environmental contamination.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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