SIDE EFFECTS: See also the Warning section. Dizziness, drowsiness, difficulty urinating, headache, weakness, changes in appetite/weight, dry mouth, blurred vision, and constipation may occur. If any of these effects persist or worsen, notify your doctor or pharmacist promptly. To relieve dry mouth, suck on (sugarless) hard candy or ice chips, chew (sugarless) gum, drink water or use a saliva substitute. To prevent constipation, maintain a diet adequate in fiber, drink plenty of water, and exercise. If you become constipated while using this drug, consult your pharmacist for help in selecting a laxative (e.g., stimulant-type with stool softener). Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Tell your doctor right away if any of these unlikely but serious side effects occur: fainting, mental/mood changes (e.g., confusion, depression, nervousness), numbness/tingling of the hands/feet, ringing in the ears, sexual problems, shakiness (tremors), severe vomiting/constipation. Tell your doctor right away if any of these rare but very serious side effects occur: severe headache, pain/redness/swelling of arms or legs. Get medical help right away if you have any very serious side effects, including: slow/fast/irregular heartbeat, severe dizziness, fainting, seizures, slurred speech, weakness on one side of the body, eye pain/swelling/redness, widened pupils, vision changes (such as seeing rainbows around lights at night), chest pain, jaw/left arm pain. This medication may increase serotonin and rarely cause a very serious condition called serotonin syndrome/toxicity. The risk increases if you are also taking other drugs that increase serotonin, so tell your doctor or pharmacist of all the drugs you take (see Drug Interactions section). Get medical help right away if you develop some of the following symptoms: fast heartbeat, hallucinations, loss of coordination, severe dizziness, severe nausea/vomiting/diarrhea, twitching muscles, unexplained fever, unusual agitation/restlessness. This medication may rarely cause serious blood problems (e.g., agranulocytosis, thrombocytopenia) or liver problems. Tell your doctor right away if you notice any of the following rare but very serious side effects: easy bleeding/bruising, signs of infection (e.g., fever, persistent sore throat), severe stomach/abdominal pain, dark urine, yellowing of the eyes/skin. A very serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction include: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

PRECAUTIONS: See also the Warning section. Before taking trimipramine, tell your doctor or pharmacist if you are allergic to it; or to other tricyclic antidepressants (e.g., amitriptyline, imipramine); or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details. Before using this medication, tell your doctor or pharmacist your medical history, especially of: blood problems (e.g., agranulocytosis, thrombocytopenia), breathing problems (e.g., asthma, chronic obstructive pulmonary disorder-COPD), diabetes, electroshock therapy, personal or family history of glaucoma (angle-closure type), heart problems (e.g., recent heart attack, arrhythmias, coronary artery disease), intestinal problems (e.g., chronic constipation, ileus), kidney problems, liver problems, other mental/mood conditions (e.g., bipolar disorder, psychosis), family history of mental/mood conditions (e.g., suicide, bipolar disorder), seizures, conditions that may increase your risk of seizures (e.g., bulimia, organic brain disease, alcohol withdrawal), overactive thyroid (hyperthyroidism), problems urinating (urinary retention, enlarged prostate). Trimipramine may cause a condition that affects the heart rhythm (QT prolongation). QT prolongation can rarely cause serious (rarely fatal) fast/irregular heartbeat and other symptoms (such as severe dizziness, fainting) that need medical attention right away. The risk of QT prolongation may be increased if you have certain medical conditions or are taking other drugs that may cause QT prolongation. Before using trimipramine, tell your doctor or pharmacist of all the drugs you take and if you have any of the following conditions: certain heart problems (heart failure, slow heartbeat, QT prolongation in the EKG), family history of certain heart problems (QT prolongation in the EKG, sudden cardiac death). Low levels of potassium or magnesium in the blood may also increase your risk of QT prolongation. This risk may increase if you use certain drugs (such as diuretics/"water pills") or if you have conditions such as severe sweating, diarrhea, or vomiting. Talk to your doctor about using trimipramine safely. This drug may make you dizzy or drowsy or blur your vision. Alcohol or marijuana can make you more dizzy or drowsy. Do not drive, use machinery, or do anything that needs alertness or clear vision until you can do it safely. Limit alcoholic beverages. Talk to your doctor if you are using marijuana. To minimize dizziness and lightheadedness, get up slowly when rising from a seated or lying position. Before having surgery, tell your doctor or dentist that you are taking this medication. This medication may make you more sensitive to the sun. Limit your time in the sun. Avoid tanning booths and sunlamps. Use sunscreen and wear protective clothing when outdoors. Tell your doctor right away if you get sunburned or have skin blisters/redness. This drug may rarely make your blood sugar rise, which can cause or worsen diabetes. If you have diabetes, check your blood sugar regularly as directed and share the results with your doctor. Tell your doctor right away if you have symptoms of high blood sugar such as increased thirst/urination. Your doctor may need to adjust your diabetes medication, exercise program, or diet. Older adults may be more sensitive to the side effects of this drug, especially dizziness (more likely when standing up), drowsiness, confusion, constipation, trouble urinating or QT prolongation (see above). Drowsiness, dizziness, or confusion can increase the risk of falling. Caution is advised when using this drug in children (see also the Warning section). This medication should be used only when clearly needed during pregnancy. Infants born to mothers who have taken similar medications during pregnancy may develop trouble urinating, lethargy, shaking (tremors), and seizures. Discuss the risks and benefits with your doctor. Since untreated mental/mood problems (such as depression) can be a serious condition, do not stop taking this medication unless directed by your doctor. If you are planning pregnancy, become pregnant, or think you may be pregnant, immediately discuss with your doctor the benefits and risks of using this medication during pregnancy. It is unknown if this medication passes into breast milk. Consult your doctor before breast-feeding.

DRUG INTERACTIONS: Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval. Some products that may interact with this drug include: anticholinergics (e.g., atropine, belladonna alkaloids), clonidine, certain drugs for high blood pressure (e.g., guanadrel, guanethidine), drugs affecting liver enzymes that remove this medication from your body (e.g., cimetidine, haloperidol, protease inhibitors such as fosamprenavir/ritonavir, drugs that affect heart rhythm such as flecainide/quinidine/propafenone), drugs for motion sickness (e.g., meclizine, scopolamine), thyroid medication. Taking MAO inhibitors with this medication may cause a serious (possibly fatal) drug interaction. Do not take any MAO inhibitors (isocarboxazid, linezolid, methylene blue, moclobemide, phenelzine, procarbazine, rasagiline, safinamide, selegiline, tranylcypromine) during treatment with this medication. Some MAO inhibitors should also not be taken for two weeks before or after treatment with this medication. Ask your doctor when to start or stop taking this medication. The risk of serotonin syndrome/toxicity increases if you are also taking other drugs that increase serotonin. Examples include street drugs such as MDMA/"ecstasy," St. John's wort, certain antidepressants (including SSRIs such as fluoxetine/paroxetine, SNRIs such as duloxetine/venlafaxine), among others. The risk of serotonin syndrome/toxicity may be more likely when you start or increase the dose of these drugs. Many drugs besides trimipramine may affect the heart rhythm (QT prolongation in the EKG), including disopyramide, dronedarone, among others. Therefore, before using trimipramine, report all medications you are currently using to your doctor or pharmacist. Tell your doctor or pharmacist if you are taking other products that cause drowsiness such as opioid pain or cough relievers (such as codeine, hydrocodone), alcohol, marijuana, drugs for sleep or anxiety (such as alprazolam, lorazepam, zolpidem), muscle relaxants (such as carisoprodol, cyclobenzaprine), or antihistamines (such as cetirizine, diphenhydramine). Check the labels on all your medicines (such as allergy or cough-and-cold products) because they may contain ingredients that cause drowsiness. Ask your pharmacist about using those products safely.

OVERDOSE: If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center. Overdose of this medication may be fatal, and symptoms include seizures, delirium and loss of consciousness.