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Phenobarbital is a barbituric acid derivative with a sedative effect. In high doses, it has a sedative and anticonvulsant effect. The drug also inhibits the production of thyroid hormones. The effect of slightly lowering blood pressure and slowing heart rate is pronounced in people with arterial hypertension. Peripherally, it reduces smooth muscle tone (has an antispasmodic effect).

Phenobarbital medication is used to treat insomnia and as a sedative to relieve symptoms of anxiety or tension. Phenobarbital tablets are also prescribed to reduce some forms of seizures. The active ingredient works by slowing down the brain and nervous system.

Phenobarbital is also used to lower bilirubin levels in infants. Bilirubin is a substance that is produced by the body and excreted by the liver. Bilirubin elimination from the body of the newborn is slower, so the drug is prescribed to speed up the process.

Phenobarbital suppresses thyroid hormone production. Peripherally reduces smooth muscle tone (has an antispasmodic effect).

What is Phenobarbital used for?

The indications for the use of this medicine are the following conditions:

  • epilepsy in any form;
  • various seizures;
  • chorea;
  • meningitis; tetanus;
  • alcohol withdrawal;
  • spastic paralysis;
  • severe insomnia;
  • various mental disorders;
  • overstimulation, anxiety.

Discontinuation of treatment with such drugs should be gradual because "withdrawal syndrome" often occurs.

When should the drug not be used? 

Phenobarbital medication should not be used if the patient is allergic to the active substance or any other substance contained in the drug. It is also not recommended for people suffering from respiratory insufficiency, severe liver failure, or porphyria, as well as for pregnant and lactating women. If you have any other medical conditions, tell your doctor to reduce the risk of side effects.

Phenobarbital: side effects

Phenobarbital medication may cause side effects. Call your doctor if any of the following symptoms are noticed:

  • drowsiness;
  • headache;
  • dizziness;
  • agitation or increased activity (especially in children);
  • nausea or vomiting.

More serious side effects include slow breathing or shortness of breath; swelling of the eyes, lips, or cheeks; rash; bloating and peeling of the skin; fever; confusion.

Phenobarbital may be addictive. Do not increase the dose; take it strictly as prescribed by your doctor.

Phenobarbital dosage

The drug is indicated for generalized tonic-clonic seizures and simple partial seizures, particularly for pharmacoresistant epilepsy. Adults can take Phenobarbital tablets independently of meals. The tablets can be divided into equal halves and washed down with plenty of liquid. Phenobarbital tablets should not be chewed. The dosage is prescribed strictly by the doctor for each patient individually. The doctor prescribes 50-250 mg once a day or divided into several doses. The highest daily dose for adults is 500 mg. If a dose is missed, it must be taken as soon as possible. When it is time to take the next tablet, skip the missed one to avoid an overdose.

Child's age

Single-dose (mg)     

Daily dose (mg)   

Up to 6 months



From 6 months to 1 year



1-2 years



3-4 years



5-6 years



7-9 years



10-14 years




For children under 3 years of age, crush the required number of tablets to a powdery state, dissolve them in water and use as suspension. The duration of treatment depends on the course of the disease.

Phenobarbital for anxiety

Phenobarbital is a barbiturate medication used to treat several conditions, including seizures, anxiety, panic attacks, and insomnia. The drug is sometimes given to patients who have been treated for chemical dependency (an example, from barbiturates).

Phenobarbital: epilepsy

Epilepsy is a condition that occurs in the central nervous system. An epileptic seizure is an expression of brain dysfunction consisting of excessive, uncontrolled bioelectrical discharges in neurons. The key here is the excessive excitability of the nerve cells.

A seizure can take many forms, such as typically generalized seizures, mild muscle tremors, or simply changes in a person's behavior. Phenobarbital (known anticonvulsant drug) controls epileptic seizures, depresses the central nervous system, and is sometimes used as a sedative. The drug is used to control tonic-clonic and simple partial seizures. 

Phenobarbital: interaction

Phenobarbital when interacting with other medications may affect their effectiveness:

  • weakening the action of hypoglycemic drugs
  • increasing the effect of analgesics (non-steroidal analgesics)
  • decrease in the effect of anticoagulants
  • decrease in the effect of contraceptives.

Phenobarbital can affect the absorption of calcium from food and drugs, which leads to a deterioration of bone calcification. Sudden discontinuation of barbiturates may increase the effect of anticoagulants (coumarin derivatives). Alcohol greatly enhances the effects of barbiturates, which can lead to collapse and even death.

If you want to buy Phenobarbital online, please consult our specialist first.

Reviews FENABBOTT 100 MG 40 TABS77.47

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Shipping & Returns

 we are a Registered and Licensed Mexican pharmacy we assure you top quality medicines without the worry of your health care provider, employer or any other group finding out what rightfully is a private issue.

Did you know that your private medical file can be used against you to raise your insurance rates or in some cases and countries to lose your job? We take your privacy very seriously and by using these payment methods and the way in which we use them your bank does not directly get charged from our pharmacy. This way your medical needs stay as private as possible.

You will also receive a complete invoice in your email with payment totals and simple payment instructions toward the bottom of the email should you wish to pay at a later convenience.

IMPORTANT: If you need to make some changes in regards an existing order, contact us within 24 hours, otherwise, Medicines Mexico is not liable due to errors on customer’s information or products presentation. 


Shipping Methods.

To ensure the delivery of your order we handle EXPRESS SHIPPING only. Signature is required.
Tracking numbers for all orders will be sent with instructions once shipped.


How long does it take to ship the drugs to my home or office?

  • Express USA time frame: 10-21 business days.   ($24.95 USD Signature required)
  • Express World Wide time frame: 15-30 business days.  ($39.95 USD Signature required)


*Due to unexpected Postal Service changes, one of the shipping methods above could be temporarily disabled.

IMPORTANT: Please ensure your mail program is configured to accept email from www.mexicanrxpharm.com sender, add our email to your non blocked email address so we may send invoices, order status and shipping confirmations. If you do not receive your invoice immediately after this, please check your spam filter and make necessary changes. 

We reply promptly to your enquiries and requests emails, but are too busy to repeatedly resend email that customers do not receive because our replies have been moved to a customers’ Spam, Junk or Bulk email folder.

Online pharmacy Medicines Mexico shipping terms and conditions.
Our team endeavors to process all orders and ship within 72 business hours. All credit card and electronic check payments for your mexicanrxpharm take 24 to 48 hours to be approved by our Payment Processor; upon verification your order will be processed. If there are any problems with your order, we will contact you, so please ensure the email address and phone number you provide is correct, and that any spam filtering software you use accepts email from www.mexicanrxpharm.com

Express Shipping.
We offer Mex Post Express Shipping as an option. This option costs from $24.95 depending on the quantity of medications in your order (up to 9 medications). This option requires a customer signature on delivery. For all other locations Express Shipping is $39.95. All packages are shipped in plain packaging to guarantee your privacy. All packages are sent by parcel express mail from Mexico. Some parcels require a signature upon delivery at our discretion. There are no other handling fees, drug dispensing fees, or Mexican customs charges. If two or more people are ordering their prescription drugs from the same address at the same time, you will be billed for only one shipping charge from our Mexico pharmacy, up to our maximum order quantities limited by customs to 90 day supply. We are able to provide a tracking number on your express shipping parcels. If after 30 business days your order has not arrived, first check with your local postal office to ensure that your package is not being held for pick-up. If you still have problems, please contact us by email and we will attempt to assist you.

Notice Left
If no one is at home at the time of delivery, the status of you order on the Postal System will be updated to “Notice Left” which means USPS attempted to deliver your item and a notice was left because an authorized recipient was not available. You may arrange redelivery by visiting or calling 800-ASK-USPS, or may pick up the item at the Post Office indicated on the notice. If this item is unclaimed after five days then it will be returned to the sender. You can pay for reshipping $24.95 in order to receive a new tracking number. (Reshipping will be issued until the package is received back in our offices).

Note that on Holidays season, the Mexican Postal, USA and other countries will be extra busy; therefore a delay is expected in packages shipped during this season. You will need to consider as well the Mexican holidays. We appreciate your understanding, our customer service will be happy to assist you and available to inform you the latest status on your existing order shipped, you can always contact us at Toll Free number or email address.

Order Cancellation
Due to our policy of same day payment processing, ORDERS CANNOT BE CANCELLED.

Due to government regulations and the possibility of tampering with medications, returns cannot be accepted. In case your package is returned due to no one was available to sign for it. You can pay for reshipping $24.95 in order to receive a new tracking number. (Reshipping will be issued until the package is received back in our offices).

How to find the online pharmacy drug you need.
There are many more medications available in Mexico that are not listed on our website. If you can’t find the Mexican drug or medication you require, please contact us and we may be able to help. Some products are listed only in a single dosage size or medicine type, but may be available in other dosages and forms. Our experienced Mexican pharmacy Pharmacists will do their best to accommodate your requirements. Please always specify the chemical name of the medication (and any applicable brand name) with all inquiries. Please feel free to ask about ANY drug. We will reply promptly to your request.

What you should know about brand and generic drug alternates.
Prescription drugs are a costly medical expense, especially for the elderly, those who are chronically ill and those with no or minimal drug coverage on their Health Insurance. However, each state in America has a law that allows pharmacists to substitute less expensive generic drugs for many brand name products. Depending on your prescription needs, your savings could be very significant. Before you talk with your doctor or pharmacist about switching, there are things you should know about generic drugs.

What is the difference between a generic and brand name drug?
Nothing except for the name, packaging, and the price, a generic drug is called by its chemical name; manufacturers assign their own brand name. The generic products have the same ingredients. Standard practice and most state laws require that a generic drug be generically equivalent to its brand name counterpart. That is, it must have the same active ingredients, strength, and dosage form, be it a pill, liquid, or injection. The generic drug also must be therapeutically equivalent. It must be the same drug chemically and have the same medical effect.

Do all drugs have generic equivalents?
No. Some drugs are protected by patents and are supplied by only one company. However, when the patent expires, other manufacturers can produce its generic version. Currently, about half the drugs on the market are available in generic form.

Will my doctor automatically prescribe generic drugs?
It depends on the physician. You can ask your doctor to write a prescription permitting substitution of a generic drug product when appropriate or to define the chemical name for the prescription. This will ensure you are purchasing the correct Mexico drug. Generic products will be as effective and less costly. Or, you can order only brand name products if you wish. www.mexicanrxpharm.com Mexico pharmacy offers a wide selection of both Brand Name & Generic Mexico medicine. Our Mexican generic drugs are of the highest quality, selected only from the most reputable manufacturers, and are safe to replace brand name medications costing much more.



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