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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Brand Name
Tetracaine Hcl
Generic Name
Tetracaine Hcl
Active Ingredient
TetracaineCategory
Standardized Chemical Allergen [EPC]
Salt Form
Hydrochloride
Variants
1
Different strengths and dosage forms
| Strength | Form | Route | NDC |
|---|---|---|---|
| 10 mg/mL | INJECTION | SUBARACHNOID | 54288-127 |
Detailed information about Tetracaine Hcl
This page is for informational purposes only and does not replace medical advice. Before using any prescription or over-the-counter medication for Tetracaine Hcl, you must consult a qualified healthcare professional.
Tetracaine is a potent ester-type local anesthetic used primarily for surface, ophthalmic, and spinal anesthesia. It works by blocking sodium channels to prevent the initiation and conduction of nerve impulses.
Dosage for tetracaine is highly individualized and must be determined by a qualified medical professional. The amount used depends on the area to be anesthetized, the vascularity of the tissues, and the specific procedure.
Tetracaine must be used with extreme caution in pediatric patients.
While tetracaine is metabolized in the plasma, its metabolites are cleared by the kidneys. No specific dose adjustments are typically required for a single dose in patients with renal impairment, but caution is advised with repeated administrations to avoid metabolite accumulation.
Because tetracaine is metabolized by plasma pseudocholinesterase rather than liver enzymes, patients with liver disease are generally at no higher risk for toxicity than healthy patients, provided their plasma esterase levels are normal. However, severe liver disease can sometimes lead to decreased production of these plasma enzymes, which would necessitate a dose reduction.
Elderly patients may be more sensitive to the effects of spinal anesthesia, including the risk of low blood pressure (hypotension). Healthcare providers often reduce the dose for spinal anesthesia in patients over the age of 65 to ensure safety.
Tetracaine is almost always administered by a healthcare professional in a clinical setting.
Since tetracaine is usually administered for a specific procedure by a doctor, missing a dose is unlikely. If you are on a schedule for topical application and miss a dose, apply it as soon as you remember. If it is almost time for the next dose, skip the missed one. Do not apply double the amount to make up for a missed dose.
An overdose of tetracaine can lead to Local Anesthetic Systemic Toxicity (LAST). This is a medical emergency.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose or apply topical tetracaine to large areas of the body without medical guidance.
When tetracaine is used as an eye drop or topical agent, certain localized reactions are very common. These are usually temporary and resolve shortly after the procedure.
> Warning: Stop using Tetracaine and call your doctor immediately or seek emergency care if you experience any of the following:
Tetracaine is intended for acute, short-term use. It is never intended for chronic use.
At this time, tetracaine does not carry a specific FDA Black Box Warning. However, it does carry significant 'Warnings and Precautions' regarding its potential for systemic toxicity and the absolute prohibition of prolonged ophthalmic use. Healthcare providers are trained to monitor for Local Anesthetic Systemic Toxicity (LAST) whenever tetracaine is administered in significant doses.
Report any unusual symptoms or persistent side effects to your healthcare provider immediately. Adverse events can also be reported to the FDA at 1-800-FDA-1088.
Tetracaine is a potent medication that must be handled with care. The most critical safety point for patients to understand is that tetracaine is for professional use only. Because it numbs the area, it eliminates the body's natural 'warning signals' (like pain), which can lead to accidental injury. For example, if your eye is numbed, you might scratch the cornea without realizing it because you cannot feel the irritation.
No FDA black box warnings for Tetracaine. However, the lack of a black box warning does not imply that the drug is without risk. The potential for systemic toxicity and severe ocular damage is well-documented in clinical literature.
When tetracaine is used for spinal anesthesia or in large topical doses, healthcare providers will monitor the following:
You should not drive or operate heavy machinery until the effects of tetracaine have completely worn off. If used in the eye, your vision may be blurred and your depth perception may be altered. If used for spinal anesthesia, your motor skills and coordination will be significantly impaired for several hours.
While there is no direct chemical interaction between tetracaine and alcohol, alcohol can increase the risk of low blood pressure and dizziness, especially following spinal anesthesia. It is generally advised to avoid alcohol for at least 24 hours after receiving tetracaine anesthesia.
Tetracaine is used as a single-dose or short-term treatment. There is no risk of a 'withdrawal syndrome' or a need for tapering. However, as the medication wears off, you may experience a return of pain or a 'pins and needles' sensation (paresthesia). Your doctor will provide instructions for managing post-procedure pain.
> Important: Discuss all your medical conditions, including any history of heart disease or allergies, with your healthcare provider before starting Tetracaine.
There are no known significant interactions between tetracaine and specific foods like grapefruit or dairy. However, if you are receiving spinal anesthesia, your doctor will likely instruct you to fast (NPO status) for several hours before the procedure to prevent complications like aspiration.
Tetracaine does not typically interfere with common blood chemistry or hematology tests. However, the presence of PABA (its metabolite) in the urine can sometimes interfere with certain specialized urine tests. Always inform the lab if you have recently received anesthesia.
Most interactions with tetracaine occur through one of two mechanisms:
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking before any procedure involving Tetracaine.
Tetracaine must NEVER be used in the following circumstances:
In these cases, a doctor will perform a careful risk-benefit analysis:
Patients should be aware of cross-sensitivity. If you are allergic to sunscreens containing PABA, you are likely allergic to tetracaine. Furthermore, there is no cross-sensitivity between ester anesthetics (like tetracaine) and amide anesthetics (like lidocaine). If you are allergic to tetracaine, your doctor can usually safely use an amide-type anesthetic instead.
> Important: Your healthcare provider will evaluate your complete medical history, including any rare genetic conditions, before prescribing or administering Tetracaine.
Tetracaine is classified by the FDA as Pregnancy Category C. This means that animal reproduction studies have shown an adverse effect on the fetus, or there are no adequate and well-controlled studies in humans.
It is not known whether tetracaine is excreted in human milk. However, because tetracaine is rapidly broken down by enzymes in the mother's blood, the amount that could potentially reach the breast milk is thought to be extremely small. Most clinical guidelines suggest that breastfeeding can be safely resumed once the mother has recovered from the effects of the anesthesia.
Tetracaine is used in children for ophthalmic and topical anesthesia, but with significant precautions.
Patients over age 65 may require adjusted care when receiving tetracaine.
In patients with kidney disease, the primary concern is the clearance of tetracaine's metabolites (PABA). While a single dose is usually safe, repeated doses could lead to metabolite buildup, which might cause irritation or allergic sensitization. No specific GFR-based dosing is standardized, but clinical monitoring is advised.
As long as the liver is producing sufficient plasma pseudocholinesterase, tetracaine is safe. However, in end-stage liver disease (Child-Pugh Class C), enzyme production may drop. In these rare cases, the half-life of tetracaine is prolonged, and the risk of systemic toxicity increases significantly.
> Important: Special populations require individualized medical assessment to ensure the safest possible anesthetic outcome.
Tetracaine is a potent inhibitor of voltage-gated sodium channels. At the molecular level, it diffuses across the nerve cell membrane in its uncharged (lipid-soluble) form. Once inside the cell, it becomes ionized and binds to a specific site within the pore of the sodium channel. This binding keeps the channel in an 'inactivated' state, preventing the flow of sodium ions into the cell. This block is 'use-dependent,' meaning the drug works more effectively on nerves that are actively trying to fire. By stopping the electrical current, tetracaine prevents the pain signal from ever reaching the central nervous system.
| Parameter | Value |
|---|---|
| Bioavailability | High (Topical/Mucous Membranes) |
| Protein Binding | 75% - 85% |
| Half-life | ~5 to 10 minutes (Plasma) |
| Tmax | Immediate (Local) |
| Metabolism | Plasma Pseudocholinesterase (Hydrolysis) |
| Excretion | Renal (Metabolites) |
Tetracaine is an Ester-type Local Anesthetic. It is distinguished from the 'Amide' class (like lidocaine) by its chemical linkage and its metabolism by plasma enzymes rather than the liver. Within the therapeutic area of anesthesiology, it is considered a long-acting local anesthetic.
Common questions about Tetracaine Hcl
Tetracaine is primarily used as a local anesthetic to numb specific parts of the body before medical procedures. Its most common applications include numbing the eye for exams or minor surgeries, providing spinal anesthesia for surgeries on the lower body, and numbing mucous membranes in the throat or nose. It is also used in some topical creams to reduce pain from needle sticks or skin procedures. Because it is very potent, it is usually reserved for procedures where a longer duration of numbness is required. It should only be administered by or under the direct supervision of a healthcare professional.
The most common side effects of tetracaine, especially when used in the eyes or on the skin, include temporary stinging, burning, and redness at the application site. These sensations usually start immediately after the drug is applied and last for about a minute. Some patients may also experience increased tearing or a temporary feeling of blurred vision. If used for spinal anesthesia, common side effects can include nausea or a temporary drop in blood pressure. Most of these effects are short-lived and resolve as the medication begins to work or wears off. However, any persistent or severe irritation should be reported to a doctor.
It is generally recommended to avoid alcohol for at least 24 hours after receiving tetracaine, particularly if it was used for spinal anesthesia. Alcohol can cause blood vessels to dilate and may lower your blood pressure, which can worsen the dizziness or lightheadedness sometimes felt after anesthesia. Furthermore, alcohol can impair your coordination and judgment, making it harder to monitor your recovery from the numbing effects. While there is no direct chemical reaction between the two, safety is the primary concern. Always follow the specific post-operative instructions provided by your surgeon or anesthesiologist regarding alcohol consumption.
Tetracaine is classified as Pregnancy Category C, meaning its safety has not been fully established through large-scale human studies. It is often used during pregnancy for spinal anesthesia during Cesarean sections, where it is generally considered safe because very little of the drug reaches the baby. However, for other elective procedures, healthcare providers usually weigh the benefits against potential risks to the fetus. If you are pregnant or planning to become pregnant, you must inform your doctor before receiving tetracaine. They will determine if it is the most appropriate anesthetic for your specific situation.
Tetracaine is known for its rapid onset of action, which is one of the reasons it is so widely used in clinical settings. When applied as eye drops, it typically begins to numb the surface of the eye within 30 seconds. For topical application to mucous membranes, the effect usually begins within 1 to 5 minutes. In the case of spinal anesthesia, the onset of numbness in the lower body generally occurs within 5 minutes of the injection. The full effect of the anesthesia will peak shortly after these times, allowing the medical procedure to proceed comfortably.
Tetracaine is not a medication that is taken on a long-term, daily basis, so 'stopping' it in the traditional sense does not apply. It is administered for a single procedure or a very short course of treatment. There are no withdrawal symptoms associated with tetracaine. However, as the medication wears off, the sensation in the numbed area will return, which may include a tingling feeling or the return of procedural pain. Your healthcare provider will usually have a plan in place for pain management (such as oral pain relievers) to take over once the tetracaine has lost its effect.
Since tetracaine is almost always administered by a doctor or nurse in a hospital or clinic, it is very unlikely that you will miss a dose. If you were instructed to apply a topical version at home and forgot, apply it as soon as you remember, unless it is nearly time for your next application. Do not apply extra medication to make up for a missed dose, as this increases the risk of systemic toxicity. If you are unsure, contact your healthcare provider's office for guidance. For procedures, the medical team will ensure the timing is correct for your surgery or exam.
No, tetracaine does not cause weight gain. Weight gain is typically a side effect associated with medications taken systemically over a long period, such as steroids or certain antidepressants. Because tetracaine is a local anesthetic used only for short-term numbing and is rapidly broken down by enzymes in the blood, it has no effect on metabolism, appetite, or fat storage. Any changes in weight you experience would be unrelated to the use of tetracaine. If you have concerns about weight changes, you should discuss them with your primary care physician.
Tetracaine can interact with certain other medications, so it is vital to provide your doctor with a full list of what you are taking. It should not be used with sulfonamide antibiotics, as it can make them less effective. It also carries risks when combined with other local anesthetics or heart rhythm medications due to additive effects on the heart and nervous system. Additionally, drugs that affect plasma enzymes (cholinesterase inhibitors) can slow down the breakdown of tetracaine, increasing the risk of side effects. Your anesthesiologist will review your medications to ensure tetracaine is safe for you.
Yes, tetracaine is widely available as a generic medication. It has been used in clinical practice for many years, and the patents for the original brand-name versions (such as Pontocaine) have long since expired. Generic tetracaine is available in various forms, including ophthalmic solutions, powders for injection, and topical formulations. Generic versions are required by the FDA to have the same quality, strength, and purity as the brand-name products. Using the generic version is a common way to reduce the cost of medical procedures while maintaining the same level of anesthetic efficacy.
Other drugs with the same active ingredient (Tetracaine)