Medically reviewed on July 4, 2018
- This medicine may be habit-forming; avoid long-term use. Use this medicine (Mydayis) as you were told by your doctor. Tell your doctor if you have a history of drug or alcohol abuse. Misuse of this medicine (Mydayis) may cause unsafe heart-related side effects or even sudden death. Tell your doctor if you have any heart disease.
Uses of Mydayis:
- It is used to treat attention deficit problems with hyperactivity.
- It may be given to you for other reasons. Talk with the doctor.
What do I need to tell my doctor BEFORE I take Mydayis?
- If you have an allergy to dextroamphetamine, amphetamine, or any other part of this medicine (Mydayis).
- If you are allergic to any drugs like this one, any other drugs, foods, or other substances. Tell your doctor about the allergy and what signs you had, like rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other signs.
- If you or a family member have any of these health problems: Blood vessel disease, high blood pressure, heart structure problems or other heart problems, or Tourette's syndrome or tics.
- If you have any of these health problems: Glaucoma; nervous, anxious, or tense state; or overactive thyroid.
- If you have ever had any of these health problems: Drug abuse or stroke.
- If you have kidney disease.
- If you are taking acetazolamide.
- If you are taking sodium bicarbonate.
- If you have taken certain drugs used for low mood (depression) like isocarboxazid, phenelzine, or tranylcypromine or drugs used for Parkinson's disease like selegiline or rasagiline in the last 14 days. Taking this medicine (Mydayis) within 14 days of those drugs can cause very bad high blood pressure.
- If you are taking any of these drugs: Linezolid or methylene blue.
- If you are breast-feeding. Do not breast-feed while you take this medicine (Mydayis).
This is not a list of all drugs or health problems that interact with this medicine (Mydayis).
Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take this medicine (Mydayis) with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.
What are some things I need to know or do while I take Mydayis?
- Tell all of your health care providers that you take this medicine (Mydayis). This includes your doctors, nurses, pharmacists, and dentists.
- Avoid driving and doing other tasks or actions that call for you to be alert until you see how this medicine (Mydayis) affects you.
- If you have been taking this medicine (Mydayis) for a long time or at high doses, it may not work as well and you may need higher doses to get the same effect. This is known as tolerance. Call your doctor if this medicine (Mydayis) stops working well. Do not take more than ordered.
- This medicine may be habit-forming with long-term use.
- If you have been taking this medicine (Mydayis) for many weeks, talk with your doctor before stopping. You may want to slowly stop this medicine (Mydayis).
- You may have some heart tests before starting this medicine (Mydayis). Talk with your doctor.
- This medicine may cause high blood pressure.
- Check blood pressure and heart rate as the doctor has told you. Talk with the doctor.
- Have blood work checked as you have been told by the doctor. Talk with the doctor.
- This medicine may affect certain lab tests. Tell all of your health care providers and lab workers that you take this medicine (Mydayis).
- Do not take antacids with this medicine (Mydayis).
- Do not switch between this product and other products that have the same drugs in them without checking with the doctor.
- New or worse behavior and mood changes like change in thinking, anger, and hallucinations have happened with this medicine (Mydayis). Tell your doctor if you or a family member have any mental or mood problems like low mood (depression) or bipolar illness, or if a family member has killed themselves. Call your doctor right away if you have hallucinations; change in the way you act; or signs of mood changes like low mood (depression), thoughts of killing yourself, nervousness, emotional ups and downs, thinking that is not normal, anxiety, or lack of interest in life.
- A very bad and sometimes deadly health problem called serotonin syndrome may happen if you take this medicine (Mydayis) with drugs for depression, migraines, or certain other drugs. Call your doctor right away if you have agitation; change in balance; confusion; hallucinations; fever; fast or abnormal heartbeat; flushing; muscle twitching or stiffness; seizures; shivering or shaking; sweating a lot; very bad diarrhea, upset stomach, or throwing up; or very bad headache.
- This medicine may affect growth in children and teens in some cases. They may need regular growth checks. Talk with the doctor.
- Different brands of this medicine (Mydayis) may be for use in different ages of children. Talk with the doctor before giving this medicine (Mydayis) to a child.
- Avoid drinking alcohol while taking this medicine (Mydayis).
- Tell your doctor if you are pregnant or plan on getting pregnant. You will need to talk about the benefits and risks of using this medicine (Mydayis) while you are pregnant.
How is this medicine (Mydayis) best taken?
Use this medicine (Mydayis) as ordered by your doctor. Read all information given to you. Follow all instructions closely.
- Take with or without food but take the same way each time. Always take with food or always take on an empty stomach.
- Take in the morning.
- Swallow whole. Do not chew, break, or crush.
- You may sprinkle contents of capsule on applesauce. Do not chew.
- After mixing, take your dose right away. Do not store for future use.
- To gain the most benefit, do not miss doses.
- Keep taking this medicine (Mydayis) as you have been told by your doctor or other health care provider, even if you feel well.
- Talk with your doctor before using OTC products that may raise blood pressure. These include cough or cold drugs, diet pills, stimulants, ibuprofen or like products, and some natural products or aids.
What do I do if I miss a dose?
- Do not take it later in the day.
- Do not take 2 doses at the same time or extra doses.
See also: Dosage Information (in more detail)
What are some side effects that I need to call my doctor about right away?
WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:
- Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
- Signs of high blood pressure like very bad headache or dizziness, passing out, or change in eyesight.
- A fast heartbeat.
- Very nervous and excitable.
- Not able to get or keep an erection.
- Change in sex interest.
- A heartbeat that does not feel normal.
- Trouble controlling body movements.
- Change in eyesight.
- For males, erections (hard penis) that happen often or that last a long time.
- Change in color of hands or feet from pale to blue or red.
- Numbness, pain, tingling, or cold feeling of the hands or feet.
- Any sores or wounds on the fingers or toes.
- Dark urine.
- Not able to pass urine or change in how much urine is passed.
- Muscle pain or weakness.
- Heart attacks, strokes, and sudden deaths have happened in adults taking this medicine (Mydayis). Sudden deaths have also happened in children with very bad heart problems or heart defects. Call your doctor right away if you have a change in strength on 1 side that is greater than the other, trouble speaking or thinking, change in balance, drooping on 1 side of the face, change in eyesight, chest pain or pressure, shortness of breath, or very bad dizziness or passing out.
What are some other side effects of Mydayis?
All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:
- Belly pain.
- Feeling nervous and excitable.
- Not hungry.
- Not able to sleep.
- Hard stools (constipation).
- Loose stools (diarrhea).
- Dry mouth.
- Bad taste in your mouth.
- Weight loss.
These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.
You may report side effects to the FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch.
See also: Side effects (in more detail)
If OVERDOSE is suspected:
If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.
How do I store and/or throw out Mydayis?
- Store at room temperature.
- Protect from light.
- Store in a dry place. Do not store in a bathroom.
- Keep all drugs in a safe place. Keep all drugs out of the reach of children and pets.
- Throw away unused or expired drugs. Do not flush down a toilet or pour down a drain unless you are told to do so. Check with your pharmacist if you have questions about the best way to throw out drugs. There may be drug take-back programs in your area.
Consumer information use
- If your symptoms or health problems do not get better or if they become worse, call your doctor.
- Do not share your drugs with others and do not take anyone else's drugs.
- Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
- Talk with the doctor before starting any new drug, including prescription or OTC, natural products, or vitamins.
- Some drugs may have another patient information leaflet. Check with your pharmacist. If you have any questions about this medicine (Mydayis), please talk with your doctor, nurse, pharmacist, or other health care provider.
- If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
More about Mydayis (amphetamine / dextroamphetamine)
- Mydayis Side Effects
- During Pregnancy
- Dosage Information
- Drug Images
- Drug Interactions
- Support Group
- Pricing & Coupons
- En Español
- 72 Reviews
- Drug class: CNS stimulants