NalDex Generic Name: Dexchlorpheniramine/Phenylephrine
Examples include NalDex and RhinaHist
NalDex is used for:
Relieving symptoms of sinus congestion, sinus pressure, runny nose, and sneezing due to colds, upper respiratory infections, and allergies. It may also be used for other conditions as determined by your doctor.
NalDex is an antihistamine and decongestant combination. The antihistamine works by blocking the action of histamine, which helps reduce symptoms such as watery eyes and sneezing. The decongestant promotes sinus and nasal drainage, which relieves congestion and pressure.
Do NOT use NalDex if:
- you are allergic to any ingredient in NalDex
- you have severe high blood pressure, severe heart blood vessel disease, rapid heartbeat, or severe heart problems
- you are taking sodium oxybate (GHB) or you have taken furazolidone or a monoamine oxidase inhibitor (MAOI) (eg, phenelzine) within the last 14 days
Contact your doctor or health care provider right away if any of these apply to you.
Before using NalDex :
Some medical conditions may interact with NalDex . Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:
- if you are pregnant, planning to become pregnant, or are breast-feeding
- if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
- if you have allergies to medicines, foods, or other substances
- if you have a fast, slow, or irregular heartbeat
- if you have a history of asthma; lung problems (eg, emphysema); sleep apnea; adrenal gland problems (eg, adrenal gland tumor); heart problems; high blood pressure; diabetes; heart blood vessel problems; stroke; glaucoma or increased pressure in the eye; a blockage of your bladder, stomach, or intestines; ulcers; trouble sleeping; trouble urinating; an enlarged prostate or other prostate problems; seizures; or thyroid problems
Some MEDICINES MAY INTERACT with NalDex . Tell your health care provider if you are taking any other medicines, especially any of the following:
- Digoxin or droxidopa because the risk of irregular heartbeat or heart attack may be increased
- Beta-blockers (eg, propranolol), catechol-O-methyltransferase (COMT) inhibitors (eg, tolcapone), furazolidone, indomethacin, MAOIs (eg, phenelzine), sodium oxybate (GHB), or tricyclic antidepressants (eg, amitriptyline) because they may increase the risk of NalDex 's side effects
- Bromocriptine or hydantoins (eg, phenytoin) because the risk of their side effects may be increased by NalDex
- Guanadrel, guanethidine, mecamylamine, methyldopa, or reserpine because their effectiveness may be decreased by NalDex
This may not be a complete list of all interactions that may occur. Ask your health care provider if NalDex may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.
How to use NalDex :
Use NalDex as directed by your doctor. Check the label on the medicine for exact dosing instructions.
- Take NalDex by mouth with or without food.
- If you miss a dose of NalDex , take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.
Ask your health care provider any questions you may have about how to use NalDex .
Important safety information:
- NalDex may cause drowsiness, dizziness, or blurred vision. These effects may be worse if you take it with alcohol or certain medicines. Use NalDex with caution. Do not drive or perform other possibly unsafe tasks until you know how you react to it.
- Do not drink alcohol or use medicines that may cause drowsiness (eg, sleep aids, muscle relaxers) while you are using NalDex ; it may add to their effects. Ask your pharmacist if you have questions about which medicines may cause drowsiness.
- Do not take diet or appetite control medicines while you are taking NalDex without checking with your doctor.
- NalDex has chlorpheniramine and phenylephrine in it. Before you begin taking any new prescription or nonprescription medicine, read the ingredients to see if it has chlorpheniramine or phenylephrine in it too. If it does or if you are not sure, contact your doctor or pharmacist.
- Do NOT take more than the recommended dose or use for longer than prescribed without checking with your doctor.
- If your symptoms do not get better within 5 to 7 days or if they get worse, check with your doctor.
- NalDex may cause you to become sunburned more easily. Avoid the sun, sunlamps, or tanning booths until you know how you react to NalDex . Use a sunscreen or wear protective clothing if you must be outside for more than a short time.
- NalDex may interfere with skin allergy tests. If you are scheduled for a skin test, talk to your doctor. You may need to stop taking NalDex for a few days before the tests.
- Tell your doctor or dentist that you take NalDex before you receive any medical or dental care, emergency care, or surgery.
- Use NalDex with caution in the ELDERLY; they may be more sensitive to its effects.
- Caution is advised when using NalDex in CHILDREN; they may be more sensitive to its effects, especially excitability.
- NalDex should be used with extreme caution in CHILDREN younger than 6 years old; safety and effectiveness in these children have not been confirmed.
- PREGNANCY and BREAST-FEEDING: If you become pregnant, contact your doctor. You will need to discuss the benefits and risks of using NalDex while you are pregnant. It is not known if NalDex is found in breast milk. Do not breast-feed while taking NalDex .
Possible side effects of NalDex :
All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:
Constipation; diarrhea; dizziness; drowsiness; dry mouth; excitability; headache; loss of appetite; nausea; nervousness or anxiety; trouble sleeping; upset stomach; vomiting; weakness.Seek medical attention right away if any of these SEVERE side effects occur:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); blurred vision or other vision changes; difficulty urinating or inability to urinate; fast or irregular heartbeat; hallucinations; mood or mental changes; persistent trouble sleeping; restlessness; seizures; severe dizziness, lightheadedness, or headache; severe drowsiness; tremor.
This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch.
If OVERDOSE is suspected:
Contact 1-800-222-1222 (the American Association of Poison Control Centers), your local poison control center (http://www.aapcc.org), or emergency room immediately. Symptoms may include blurred vision; confusion; hallucinations; ringing in the ears; seizures; severe dizziness, lightheadedness, or headache; severe drowsiness; unusually fast, slow, or irregular breathing; unusually fast, slow, or irregular heartbeat.Proper storage of NalDex :
Store NalDex at room temperature, between 59 and 86 degrees F (15 and 30 degrees C). Store away from heat, moisture, and light. Do not store in the bathroom. Keep NalDex out of the reach of children and away from pets.
- If you have any questions about NalDex , please talk with your doctor, pharmacist, or other health care provider.
- NalDex is to be used only by the patient for whom it is prescribed. Do not share it with other people.
- If your symptoms do not improve or if they become worse, check with your doctor.
This information is a summary only. It does not contain all information about NalDex . If you have questions about the medicine you are taking or would like more information, check with your doctor, pharmacist, or other health care provider.