Do not take this medication with any of the following medicines:

-narcotic medicines for cough

This medicine may also interact with the following medications:

-alcohol
-antihistamines for allergy, cough and cold
-certain medicines for anxiety or sleep
-certain medicines for blood pressure, heart disease, irregular heart beat
-certain medicines for depression like amitriptyline, fluoxetine, sertraline
-certain medicines for seizures like phenobarbital, primidone
-female hormones, like estrogens or progestins and birth control pills, patches, rings, or injections
-general anesthetics like halothane, isoflurane, methoxyflurane, propofol
-local anesthetics like lidocaine, pramoxine, tetracaine
-medicines that relax muscles for surgery
-narcotic medicines for pain
-phenothiazines like chlorpromazine, mesoridazine, prochlorperazine, thioridazine

They need to know if you have any of these conditions:
-heart disease
-liver disease
-lung or breathing disease, like asthma
-an unusual or allergic reaction to dantrolene, other 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 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.

If you are taking another medicine that also causes drowsiness, you may have more side effects. Give your health care provider a list of all medicines you use. Your doctor will tell you how much medicine to take. Do not take more medicine than directed. Call emergency for help if you have problems breathing or unusual sleepiness.

This medicine can make you more sensitive to the sun. Keep out of the sun. If you cannot avoid being in the sun, wear protective clothing and use sunscreen. Do not use sun lamps or tanning beds/booths.

Keep out of the reach of children.

Store at room temperature below 40 degrees C (104 degrees F). Throw away any unused medicine after the expiration date.