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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Meclizine Hydrochloride
Brand Name
Meclizine Hydrochloride
Generic Name
Meclizine Hydrochloride
Active Ingredient
MeclizineCategory
Central Nervous System Stimulant [EPC]
Salt Form
Hydrochloride
Variants
66
Different strengths and dosage forms
| Strength | Form | Route | NDC |
|---|---|---|---|
| 25 mg/1 | TABLET, CHEWABLE | ORAL | 68071-2574 |
| 25 mg/1 | TABLET | ORAL | 70518-3815 |
| 25 mg/1 | TABLET | ORAL | 70710-1162 |
This page is for informational purposes only and does not replace medical advice. Before using any prescription or over-the-counter medication for Meclizine Hydrochloride, you must consult a qualified healthcare professional.
| 25 mg/1 | TABLET | ORAL | 71205-786 |
| 25 mg/1 | TABLET | ORAL | 82868-058 |
| 25 mg/1 | TABLET | ORAL | 68071-3748 |
| 25 mg/1 | TABLET, CHEWABLE | ORAL | 71335-2177 |
| 25 mg/1 | TABLET, CHEWABLE | ORAL | 71610-836 |
| 25 mg/1 | TABLET, CHEWABLE | ORAL | 72789-250 |
| 12.5 mg/1 | TABLET | ORAL | 16571-660 |
| 12.5 mg/1 | TABLET | ORAL | 53746-441 |
| 12.5 mg/1 | TABLET | ORAL | 71335-1563 |
+ 38 more variants
Detailed information about Meclizine Hydrochloride
Meclizine is a first-generation antihistamine and antiemetic used primarily to manage symptoms of vertigo and prevent motion sickness. It works by reducing activity in the part of the inner ear that controls balance and by blocking histamine receptors in the brain.
The dosage of meclizine is highly individualized based on the condition being treated and the patient's response to the medication. Healthcare providers typically follow these general guidelines:
The safety and efficacy of meclizine in pediatric patients below the age of 12 have not been established through rigorous clinical trials.
Specific dosage adjustment guidelines for patients with kidney disease are not provided in the standard FDA labeling. However, because a portion of the drug and its metabolites are cleared renally, healthcare providers may exercise caution in patients with severe renal impairment to avoid potential accumulation.
Since meclizine is extensively metabolized by the liver, patients with significant hepatic impairment (liver disease) may experience reduced clearance of the drug. This can lead to higher plasma concentrations and an increased risk of sedation and anticholinergic side effects. Your doctor may start with the lowest possible dose and monitor you closely.
Geriatric patients are often more sensitive to the effects of meclizine, particularly its sedative and anticholinergic properties (such as confusion or urinary retention). Clinical guidelines, including the Beers Criteria, suggest using meclizine with extreme caution in the elderly due to the increased risk of falls and cognitive impairment. Doctors often recommend starting at 12.5 mg to assess tolerance.
To ensure maximum efficacy and safety, follow these administration instructions:
If you miss a dose of meclizine, take it as soon as you remember. However, if it is almost time for your next scheduled dose, skip the missed dose and return to your regular dosing schedule. Do not take two doses at once to 'make up' for a missed one, as this increases the risk of excessive sedation.
An overdose of meclizine can lead to severe anticholinergic toxicity. Symptoms may include extreme drowsiness, seizures, hallucinations, dilated pupils, a rapid heartbeat (tachycardia), and dangerously high body temperature. In children, an overdose may paradoxically cause excitation or agitation before leading to CNS depression. If an overdose is suspected, contact a poison control center or seek emergency medical attention immediately.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose without medical guidance. Over-reliance on meclizine for 'dizziness' without a diagnosis can mask serious neurological conditions.
As a first-generation antihistamine, meclizine is known to cause several common side effects related to its action on the central nervous system and its anticholinergic properties. The most frequently reported include:
Meclizine is a central nervous system (CNS) depressant. This means it slows down brain activity to achieve its therapeutic effects. Patients must be aware that this medication can significantly impair mental alertness and physical coordination. You should not perform tasks that require high levels of concentration—such as driving a car or operating heavy machinery—until you are certain how meclizine affects you. Even if you do not 'feel' sleepy, your reaction times may be delayed.
No FDA black box warnings for Meclizine. Despite the lack of a black box warning, the drug's potential for sedation and its anticholinergic profile necessitate careful medical supervision, particularly in patients with multiple comorbidities or those taking other medications.
There are few drugs that are strictly contraindicated with meclizine, but the most significant risks involve other drugs that cause extreme CNS depression.
Meclizine must NEVER be used in the following circumstances:
These are conditions where the benefit must be carefully weighed against the risk by a healthcare professional:
Meclizine was formerly classified as FDA Pregnancy Category B. This means that animal reproduction studies have failed to demonstrate a risk to the fetus, but there are no adequate and well-controlled studies in pregnant women.
It is not known whether meclizine is excreted in human breast milk. However, many antihistamines do pass into milk in small amounts.
Meclizine is an H1-receptor antagonist with significant anticholinergic and central nervous system depressant properties. Its primary site of action for anti-vertigo effects is the vestibular system and the vomiting center in the medulla. By blocking H1 receptors, it inhibits the vasodilation and increased capillary permeability usually caused by histamine. More importantly, its anticholinergic action reduces the excitability of the labyrinthine hair cells and the vestibular nuclei, effectively 'quieting' the signals sent from the inner ear to the brain. It also acts on the chemoreceptor trigger zone (CTZ) to reduce the urge to vomit.
Common questions about Meclizine Hydrochloride
Meclizine is a medication primarily used to treat and prevent the symptoms of motion sickness, such as nausea, vomiting, and dizziness. Additionally, it is frequently prescribed by healthcare providers to manage vertigo, which is a sensation of spinning or loss of balance often caused by inner ear problems. It belongs to a class of drugs called antihistamines, but it is specifically valued for its ability to dampen the signals from the vestibular system in the ear to the brain. While it is effective for these conditions, it does not treat the underlying cause of the balance disorder. Most people use it for short-term relief during travel or during an acute flare-up of a condition like Meniere's disease.
The most common side effect of meclizine is drowsiness, which can range from mild to severe depending on the dose and the individual's sensitivity. Many patients also experience dry mouth, as the medication has anticholinergic properties that reduce saliva production. Fatigue and a general feeling of tiredness are also frequently reported, especially when first starting the medication. Some people may notice blurred vision or a dry nose and throat. Because of the risk of sedation, it is important to see how the drug affects you before driving or operating machinery. These side effects are generally temporary and resolve once the medication is stopped.
No, you should avoid drinking alcohol while taking meclizine. Both alcohol and meclizine are central nervous system depressants, meaning they slow down brain activity and coordination. When taken together, they can significantly increase the risk of extreme drowsiness, severe dizziness, and impaired judgment. This combination makes activities like driving much more dangerous and can even lead to respiratory depression in high doses. Even a small amount of alcohol can amplify the side effects of meclizine, so it is best to abstain entirely during your treatment. If you have consumed alcohol, wait until its effects have completely worn off before taking a dose of meclizine.
Meclizine is generally considered to have a low risk during pregnancy, but it should only be used if clearly needed and under the supervision of a doctor. Historically, it was categorized as a Pregnancy Category B drug, indicating that animal studies showed no harm to the fetus. While large studies in humans have not found a consistent link between meclizine and birth defects, it is not the first-line choice for pregnancy-related nausea. Most doctors prefer to start with vitamin B6 or doxylamine for morning sickness. If you are pregnant or planning to become pregnant, discuss the risks and benefits with your healthcare provider before using meclizine. It is especially important to avoid unnecessary medications during the first trimester.
Meclizine typically begins to work within 30 to 60 minutes after you take an oral dose. For the prevention of motion sickness, it is highly recommended to take the medication at least one hour before you begin traveling or engage in the activity that causes dizziness. This allows the drug to reach effective levels in your bloodstream and begin suppressing the vestibular system before the motion stimulus starts. The peak effect usually occurs between 1.5 and 3 hours after administration. Because it has a long duration of action, a single dose can provide relief for 8 to 24 hours. If you take it after you already feel sick, it may take longer to provide relief.
In most cases, meclizine can be stopped suddenly without causing dangerous withdrawal symptoms, as it is not an addictive medication. However, if you have been taking it daily for a long period to manage chronic vertigo, stopping it abruptly might cause a temporary 'rebound' of your symptoms. This means your dizziness or spinning sensation could return more intensely for a few days as your brain readjusts. For those using it for motion sickness, you can stop taking it as soon as your travel is over. If you are concerned about stopping the medication, your doctor can help you gradually reduce the dose. It is also important to transition into vestibular rehabilitation exercises if you have a permanent balance issue.
If you miss a dose of meclizine, you should take it as soon as you remember. However, if it is already close to the time for your next scheduled dose, it is better to skip the missed dose entirely and continue with your regular schedule. You should never take two doses at the same time to make up for a missed one, as this significantly increases the risk of side effects like extreme sedation and dry mouth. If you are taking meclizine only as needed for motion sickness, a missed dose is less of a concern; simply take the next dose when needed, keeping in mind it takes about an hour to work. Setting a reminder on your phone can help if you are on a strict schedule for vertigo.
Weight gain is not a commonly reported side effect of meclizine. Unlike some other classes of antihistamines or psychiatric medications that are taken long-term, meclizine does not typically interfere with metabolism or appetite in a way that leads to significant weight changes. Most people use meclizine for short periods, which further reduces the likelihood of weight-related issues. If you notice unexpected weight gain while taking meclizine, it is likely due to another factor, such as a different medication, a change in activity levels due to dizziness, or an underlying health condition. Always discuss significant weight changes with your healthcare provider to identify the cause.
Meclizine can interact with several other types of medications, so caution is necessary. It should not be combined with other drugs that cause sleepiness, such as opioid pain relievers, sleep aids, muscle relaxants, or benzodiazepines, as this can lead to dangerous levels of sedation. It also interacts with other anticholinergic drugs, which can worsen side effects like dry mouth, constipation, and urinary retention. Some antidepressants and antipsychotics can also increase the 'anticholinergic load' on your body. Always provide your doctor or pharmacist with a complete list of all the medications, vitamins, and herbal supplements you are currently taking to avoid potentially harmful interactions.
Yes, meclizine is widely available as a generic medication and is generally very affordable. Generic meclizine hydrochloride is sold in the same strengths as the brand-name versions (like Antivert or Bonine), typically in 12.5 mg and 25 mg tablets. Generic versions are required by the FDA to have the same active ingredient, strength, dosage form, and route of administration as the brand-name drug. You can find generic meclizine both as a prescription from a pharmacy and as an over-the-counter product in the travel or allergy aisle of most drugstores. Choosing the generic version is a cost-effective way to manage symptoms of vertigo and motion sickness without sacrificing quality.
Other drugs with the same active ingredient (Meclizine)
Some patients may experience side effects that are less frequent but still notable:
Rarely, meclizine can cause more unusual reactions, including:
While meclizine is generally considered safe for most people, certain reactions require emergency intervention.
> Warning: Stop taking Meclizine and call your doctor immediately if you experience any of these.
Meclizine is generally intended for short-term use (e.g., during a bout of vertigo or for the duration of a trip). Long-term use is generally discouraged because it can interfere with 'vestibular compensation.' This is the brain's natural ability to adapt to a permanent inner ear injury. By suppressing the vestibular system chronically, meclizine may actually delay long-term recovery from certain balance disorders. Additionally, chronic use of anticholinergic drugs has been investigated in recent years for a potential link to increased risks of cognitive decline and dementia in older adults, though specific data for meclizine is still being studied.
There are currently no FDA black box warnings for meclizine. It is considered to have a relatively low potential for severe toxicity when used as directed. However, its use in specific populations (like the elderly) is guided by clinical precautions rather than formal black box mandates.
Report any unusual symptoms to your healthcare provider to ensure your treatment plan remains safe and effective.
For short-term use (e.g., preventing motion sickness for a one-day trip), routine lab monitoring is generally not required. However, for patients prescribed meclizine for chronic vertigo, healthcare providers may perform the following:
Because meclizine frequently causes drowsiness and blurred vision, it is classified as a drug that can impair driving ability. In many jurisdictions, driving while impaired by an antihistamine can carry the same legal penalties as driving under the influence of alcohol. Always assess your level of alertness before getting behind the wheel.
Alcohol significantly increases the sedative effects of meclizine. Combining the two can lead to profound CNS depression, extreme dizziness, and an increased risk of accidents or respiratory depression. It is strongly advised to avoid all alcohol consumption while taking meclizine.
There is no evidence that meclizine causes physical dependence or a traditional 'withdrawal syndrome.' However, if you have been taking it for a long period to manage vertigo, stopping it suddenly may cause a 'rebound' effect where your dizziness returns more intensely for a short period. It is often best to taper the dose under a doctor's guidance while beginning vestibular rehabilitation exercises.
> Important: Discuss all your medical conditions with your healthcare provider before starting Meclizine, especially if you have a history of eye, bladder, or liver problems.
For each major interaction, the primary concern is either the pharmacodynamic effect (the drugs work together to cause too much sedation) or the pharmacokinetic effect (one drug changes how the other is processed by the liver).
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking, including those you only take occasionally.
As mentioned, the piperazine class of drugs is the primary area of concern. If you have had a skin rash, hives, or breathing trouble after taking Zyrtec (cetirizine) or Vistaril (hydroxyzine), you should inform your doctor before taking meclizine. While they are used for different purposes, their molecular structures are similar enough to trigger the same immune response.
> Important: Your healthcare provider will evaluate your complete medical history, including any history of eye or urinary problems, before prescribing Meclizine.
As previously noted, meclizine is not recommended for children under the age of 12. In older children, it should be used with caution as they may be more prone to 'paradoxical excitation,' where the drug causes them to become hyperactive or agitated rather than sleepy. It is not approved for the treatment of 'colic' or general nausea in young children.
The elderly represent the highest-risk group for meclizine use.
In patients with a low Glomerular Filtration Rate (GFR), the metabolites of meclizine may accumulate. While specific dose-reduction tables do not exist, a conservative approach (lower doses, longer intervals) is usually recommended for those with Stage 4 or 5 chronic kidney disease.
For patients with mild to moderate hepatic impairment (Child-Pugh Class A or B), meclizine should be used with caution. In severe hepatic impairment (Child-Pugh Class C), the drug is generally avoided due to the high risk of CNS toxicity.
> Important: Special populations require individualized medical assessment to balance the relief of vertigo symptoms against the risks of sedation and anticholinergic side effects.
| Parameter | Value |
|---|---|
| Bioavailability | Not precisely quantified; absorbed orally |
| Protein Binding | Very High |
| Half-life | 5 to 6 hours (plasma); effect lasts 24h |
| Tmax | 1.5 to 3 hours |
| Metabolism | Hepatic (primarily via CYP2D6) |
| Excretion | Primarily Fecal/Hepatic; minor Renal |
Meclizine is classified as a First-Generation Antihistamine and an Antiemetic. Within the antihistamine family, it is specifically a Piperazine derivative. It is related to other medications like cyclizine and hydroxyzine, though it is more specifically targeted toward vestibular disorders than generalized allergy relief.