Generic Name: phenylephrine (fen-il-EFF-rin)
Brand Name: Lusonal
Phenylephrine liquid is used for:
Relieving congestion due to colds, flu, and allergies. It may also be used for other conditions as determined by your doctor.
Phenylephrine liquid is a decongestant. It works by reducing swelling and constricting blood vessels in the nasal passages, allowing you to breathe more easily.
Do NOT use phenylephrine liquid if:
- you are allergic to any ingredient in phenylephrine liquid
- you are taking furazolidone or have taken a monoamine oxidase (MAO) inhibitor (eg, phenelzine) in the last 14 days
- you have high blood pressure or an abnormally fast heartbeat
Contact your doctor or health care provider right away if any of these apply to you.
Before using phenylephrine liquid:
Some medical conditions may interact with phenylephrine liquid. 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 heart disease, diabetes, phenylketonuria (PKU), an adrenal gland tumor, or thyroid disease
Some MEDICINES MAY INTERACT with phenylephrine liquid. Tell your health care provider if you are taking any other medicines, especially any of the following:
- Rauwolfia derivatives (eg, reserpine) or tricyclic antidepressants (eg, amitriptyline) because the effectiveness of phenylephrine liquid may be decreased
- Cocaine, furazolidone, methyldopa, MAO inhibitors (eg, phenelzine), oxytocic medicines (eg, oxytocin), rauwolfia derivatives (eg, reserpine), or tricyclic antidepressants (eg, amitriptyline) because the actions and side effects of phenylephrine liquid may be increased
- Bromocriptine, catechol-O-methyltransferase (COMT) inhibitors (eg, entacapone), or droxidopa because the actions and side effects of these medicines may be increased
- Guanethidine because its effectiveness may be decreased by phenylephrine liquid
This may not be a complete list of all interactions that may occur. Ask your health care provider if phenylephrine liquid 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 phenylephrine liquid:
Use phenylephrine liquid as directed by your doctor. Check the label on the medicine for exact dosing instructions.
- Take phenylephrine liquid with food, water, or milk to minimize stomach irritation.
- Use a measuring device marked for medicine dosing. Ask your pharmacist for help if you are unsure of how to measure your dose.
- If you miss a dose of phenylephrine liquid and are taking it regularly, 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 phenylephrine liquid.
Important safety information:
- Phenylephrine liquid may cause dizziness. Do not drive, operate machinery, or do anything else that could be dangerous until you know how you react to phenylephrine liquid. Using phenylephrine liquid alone, with certain other medicines, or with alcohol may lessen your ability to drive or perform other potentially dangerous tasks.
- If your symptoms do not improve within 7 days or if you develop a high fever, check with your doctor.
- If you have trouble sleeping, ask your pharmacist or doctor about the best time to take phenylephrine liquid.
- Do not take diet or appetite control medicines while you are taking phenylephrine liquid.
- Phenylketonuria patients - Phenylephrine liquid may contain phenylalanine.
- Diabetes patients - Phenylephrine liquid may affect your blood sugar. Check blood sugar levels closely and ask your doctor before adjusting the dose of your diabetes medicine.
- Use phenylephrine liquid with caution in the ELDERLY because they may be more sensitive to its effects.
- Use phenylephrine liquid with extreme caution in CHILDREN younger than 2 years of age. Safety and effectiveness in this age group have not been confirmed.
- PREGNANCY and BREAST-FEEDING: If you become pregnant, discuss with your doctor the benefits and risks of using phenylephrine liquid during pregnancy. It is unknown if phenylephrine liquid is excreted in breast milk. If you are or will be breast-feeding while you are using phenylephrine liquid, check with your doctor or pharmacist to discuss the risks to your baby.
When used for long periods of time or at high doses, some people develop a need to continue taking phenylephrine liquid. This is known as DEPENDENCE or addiction. If you are addicted and suddenly stop taking phenylephrine liquid, you may experience WITHDRAWAL symptoms, including depression.
Possible side effects of phenylephrine liquid:
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:
Seek medical attention right away if any of these SEVERE side effects occur:
Difficulty urinating; dizziness; headache; nausea; nervousness; restlessness; sleeplessness; stomach irritation.
Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue).
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. To report side effects to the appropriate agency, please read the Guide to Reporting Problems to FDA.
If OVERDOSE is suspected:
Contact 1-800-222-1222 (the American Association of Poison Control Centers), your local poison control center, or emergency room immediately. Symptoms may include confusion; hallucinations; irregular or unusually slow or rapid heartbeat; rapid breathing; seizures.Proper storage of phenylephrine liquid:
Store phenylephrine liquid 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 phenylephrine liquid out of the reach of children and away from pets.
- If you have any questions about phenylephrine liquid, please talk with your doctor, pharmacist, or other health care provider.
- Phenylephrine liquid 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.
- Check with your pharmacist about how to dispose of unused medicine.
This information should not be used to decide whether or not to take phenylephrine liquid or any other medicine. Only your health care provider has the knowledge and training to decide which medicines are right for you. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about phenylephrine liquid. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to phenylephrine liquid. This information is not specific medical advice and does not replace information you receive from your health care provider. You must talk with your healthcare provider for complete information about the risks and benefits of using phenylephrine liquid.
Disclaimer: This information should not be used to decide whether or not to take this medicine or any other medicine. Only your health care provider has the knowledge and training to decide which medicines are right for you. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about this medicine. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to this medicine. This information is not specific medical advice and does not replace information you receive from your health care provider. You must talk with your healthcare provider for complete information about the risks and benefits of using this medicine.
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