What happens if I miss a dose (Intuniv, Tenex)?
Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
Call your doctor for instructions if you miss more than 2 doses in a row.
What happens if I overdose (Intuniv, Tenex)?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
Overdose symptoms may include drowsiness, dizziness, slow heart rate, or feeling like you might pass out.
What should I avoid while taking guanfacine (Intuniv, Tenex)?
Avoid taking guanfacine with a high-fat meal.
Guanfacine may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert.
Avoid becoming overheated or dehydrated during exercise and in hot weather while you are taking guanfacine.
Drinking alcohol can increase certain side effects of guanfacine.
What other drugs will affect guanfacine (Intuniv, Tenex)?
Before you take guanfacine, tell your doctor if you regularly use other medicines that make you sleepy (such as cold or allergy medicine, sedatives, narcotic pain medicine, sleeping pills, muscle relaxers, and medicine for seizures, depression, anxiety, or psychiatric disorders). They can add to sleepiness caused by guanfacine.
Tell your doctor about all other medications you use, especially any other blood pressure medications, or:
- bosentan (Tracleer);
- conivaptan (Vaprisol);
- dexamethasone (Decadron, Hexadrol);
- diclofenac (Arthrotec, Cataflam, Voltaren, Flector Patch, Solareze);
- St. John's wort;
- imatinib (Gleevec);
- isoniazid (for treating tuberculosis);
- valproic acid (Depakene, Stavzor);
- an antibiotic such as clarithromycin (Biaxin), dalfopristin/quinupristin (Synercid), erythromycin (E.E.S., EryPed, Ery-Tab, Erythrocin), rifampin (Rifadin, Rifater, Rifamate), or telithromycin (Ketek);
- antifungal medication such as clotrimazole (Mycelex Troche), itraconazole (Sporanox), ketoconazole (Nizoral), or voriconazole (Vfend);
- an antidepressant such as nefazodone;
- a barbiturate such as butabarbital (Butisol), secobarbital (Seconal), pentobarbital (Nembutal), or phenobarbital (Solfoton);
- a calcium channel blocker such as diltiazem (Cartia, Cardizem), felodipine (Plendil), nifedipine (Nifedical, Procardia), verapamil (Calan, Covera, Isoptin, Verelan), and others;
- HIV or AIDS medicine such as atazanavir (Reyataz), delavirdine (Rescriptor), efavirenz (Sustiva), etravirine (Intelence), fosamprenavir (Lexiva), indinavir (Crixivan), nelfinavir (Viracept), nevirapine (Viramune), saquinavir (Invirase), or ritonavir (Norvir); or
- seizure medication such as carbamazepine (Carbatrol, Tegretol), felbamate (Felbatol), oxcarbazepine (Trileptal), phenytoin (Dilantin), or primidone (Mysoline).
This list is not complete and other drugs may interact with guanfacine. Tell your doctor about all medications you use. This includes prescription, over-the-counter, vitamin, and herbal products. Do not start a new medication without telling your doctor.
Where can I get more information?
Your pharmacist can provide more information about guanfacine.
Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
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