Check with your doctor:
If the medicine stops working as well as it did when you first started using it. This may mean that you are in danger of becoming dependent on the medicine. Do not try to get better pain relief by increasing the dose
If you are having headaches more often than you did before you started using this medicine. This is especially important if a new headache occurs within 1 day after you took your last dose of headache medicine, headaches begin to occur every day, or a headache continues for several days in a row. This may mean that you are dependent on the headache medicine. Continuing to take this medicine will cause even more headaches later on. Your doctor can give you advice on how to relieve the headaches.
Check the labels of all nonprescription (over-the-counter [OTC]) and prescription medicines you now take. If any contain a narcotic, a barbiturate, aspirin, or other salicylates, including diflunisal, check with your doctor or pharmacist. Taking them together with this medicine may cause an overdose.
Codeine is changed to morphine in the body. Some people change codeine to morphine more quickly than others. These individuals are called "ultra-rapid metabolizers of codeine". Contact your doctor immediately if you experience extreme sleepiness, confusion, or shallow breathing. These symptoms may indicate that you are an "ultra-rapid metabolizer of codeine". As a result, there is too much morphine in the body and more side effects of morphine than usual
If a nursing mother is an ultra-rapid metabolizer of codeine, it could lead to a morphine overdose in the nursing baby and cause very serious side effects . For nursing mothers taking this medicine:
Talk to your doctor if you have any questions about taking codeine or about how this medicine may affect your baby.
Call your doctor if you become extremely tired and have difficulty caring for your baby.
Your baby should generally nurse every two to three hours and should not sleep more than four hours at a time.
Check with your doctor or hospital emergency room immediately if your baby shows signs of increased sleepiness (more than usual), difficulty breast-feeding, difficulty breathing, or limpness. These may be symptoms of an overdose and need immediate medical attention .
The butalbital and the codeine in this medicine will add to the effects of alcohol and other central nervous system (CNS) depressants (medicines that slow down the nervous system, possibly causing drowsiness). Some examples of CNS depressants are antihistamines or medicine for hay fever, other allergies, or colds; sedatives, tranquilizers, or sleeping medicine; other prescription pain medicine or narcotics; other barbiturates; medicine for seizures; muscle relaxants; or anesthetics, including some dental anesthetics. Also, stomach problems may be more likely to occur if you drink alcoholic beverages while you are taking aspirin. Therefore, do not drink alcoholic beverages, and check with your doctor before taking any of the medicines listed above, while you are using this medicine.
This medicine may cause some people to become drowsy, dizzy, or lightheaded, or to feel a false sense of well-being. Make sure you know how you react to this medicine before you drive, use machines, or do anything else that could be dangerous if you are dizzy or are not alert and clearheaded.
Dizziness, light-headedness, or fainting may occur, especially when you get up suddenly from a lying or sitting position. Getting up slowly may help lessen this problem. Lying down for a while may relieve these effects.
Nausea or vomiting may occur, especially after the first couple of doses. This effect may go away if you lie down for a while. However, if nausea or vomiting continues, check with your doctor.
Before having any kind of surgery (including dental surgery) or emergency treatment, tell the medical doctor or dentist in charge that you are taking this medicine. Serious side effects can occur if your medical doctor or dentist gives you certain medicines without knowing that you have taken butalbital or codeine.
Do not take this medicine for 5 days before any planned surgery, including dental surgery, unless otherwise directed by your medical doctor or dentist. Taking aspirin during this time may cause bleeding problems.
Before you have any medical tests, tell the person in charge that you are taking this medicine. The caffeine in this combination interferes with the results of certain tests that use dipyridamole (e.g., Persantine) to help show how well blood is flowing to your heart. Caffeine should not be taken for 8 to 12 hours before the test. The results of some other tests may also be affected by this medicine.
If you have been taking large amounts of this medicine, or if you have been taking it regularly for several weeks or more, do not suddenly stop using it without first checking with your doctor. Your doctor may want you to reduce gradually the amount you are taking before stopping completely, to lessen the chance of withdrawal side effects.
If you think you or anyone else may have taken an overdose of this medicine, get emergency help at once. Taking an overdose of this medicine or taking alcohol or CNS depressants with this medicine may lead to unconsciousness or death. Signs of overdose of this medicine include convulsions (seizures); hearing loss; confusion; ringing or buzzing in the ears; severe excitement, nervousness, or restlessness; severe dizziness; severe drowsiness; unusually slow or troubled breathing; and severe weakness.