Do not take this medicine with any of the following medications:
-voriconazole

This medicine may also interact with the following medications:
-alcohol
-antihistamines for allergy, cough and cold
-cyclosporine
-doxycycline
-female hormones, like estrogens or progestins and birth control pills
-griseofulvin
-imatinib
-kava kava
-MAOIs like Carbex, Eldepryl, Marplan, Nardil, and Parnate
-medicines for depression, anxiety, or psychotic disturbances
-medicines for seizures
-medicines for sleep
-muscle relaxants
-narcotic medicines for pain
-other barbiturates
-primidone
-quinidine
-steroid medicines like prednisone or cortisone
-valerian
-warfarin

They need to know if you have any of these conditions:
-depression
-drug abuse or addiction
-if you frequently drink alcohol containing drinks
-kidney disease
-liver disease
-lung or breathing disease, like asthma
-porphyria
-suicidal thoughts, plans, or attempt; a previous suicide attempt by you or a family member
-an unusual or allergic reaction to pentobarbital, other barbiturates, medicines, foods, dyes, or preservatives
-pregnant or trying to get pregnant
-breast-feeding

Your condition will be monitored carefully while you are receiving this medicine.

You may develop tolerance to the medicine. Tolerance means that you will need a higher dose of the medicine for pain relief. Tolerance is normal and is expected if you take the medicine for a long time.

Do not suddenly stop taking your medicine because you may develop a severe reaction. Your body becomes used to the medicine. This does NOT mean you are addicted. Addiction is a behavior related to getting and using a drug for a non-medical reason. If you have pain, you have a medical reason to take pain medicine. Your doctor will tell you how much medicine to take. If your doctor wants you to stop the medicine, the dose will be slowly lowered over time to avoid any side effects.

You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells. Alcohol may interfere with the effect of this medicine. Avoid alcoholic drinks.

The use of this medicine may increase the chance of suicidal thoughts or actions. Pay special attention to how you are responding while on this medicine. Any worsening of mood, or thoughts of suicide or dying should be reported to your health care professional right away.

This drug is given in a hospital or clinic and will not be stored at home.