What to Do If You Miss a Dose of Your Medication

Missing taking medication is a common problem for anyone taking regularly prescribed medicines. Knowing what to do can make a significant difference to your health. Your response will depend on the medicine you are taking, when your last dose was due (or should have been), and the illness or medical condition it treats. There is no single correct approach for everyone. Nonetheless, there are several basic rules that can help you decide what to do. Additionally, there are certain medications for chronic illnesses that you should always consult your doctor about rather than guessing.
According to a scientific review (2021) in the European Journal of Clinical Pharmacology, the advice on missed doses in patient information leaflets is generally inadequate [1]. This makes it even more important for patients to know what to do if they have missed a dose of their medication.

Why Missing a Dose Matters

Every medicine has a half-life. It is the time it takes for its concentration in the bloodstream to be reduced by half. Medicines with a short half-life leave the body quickly, meaning even a single missed dose can cause medication levels to fall below the amount needed for the medicine to work. Medicines with a longer half-life remain active in the body for much longer, so a missed dose is less likely to cause an immediate change in effectiveness. The consequence of missing a dose is therefore not the same for every medicine; it depends on how that particular medication behaves once it enters the body [1].
Some medicines need to maintain a stable concentration in the blood to work properly, such as anticoagulants, anti-epileptics, and many psychiatric medications. When levels dip below the therapeutic threshold, even briefly, the condition being treated can begin to return or worsen. In other cases, abruptly missing doses of a medicine that suppresses a physiological process, such as a beta-blocker, can trigger a rebound effect in which the body temporarily overreacts, causing a spike in heart rate or blood pressure [2]. This is why the same missed dose can be inconsequential for one medicine and clinically significant for another.

What to do if you miss a dose?

• For most once-daily medications, you can generally take a missed dose if you remember within approximately six to eight hours of your scheduled time, though this window varies significantly between medications and should be confirmed by reading your patient information leaflet or contacting your doctor [3].
• If it is almost time for your next dose, skip the missed dose and take only the next scheduled dose at the usual time.
• If you are unsure when you last took your medication, do not attempt to estimate. Contact your doctor before taking any dose.
• If you miss two or more consecutive doses, do not double up; call your pharmacist or prescribing doctor for guidance.

If You Are Regularly Missing Doses

Sometimes just forgetting one dose is normal. But if you find yourself consistently missing doses (due to a complicated schedule, side effects, cost, etc.), then this should be discussed with your doctor. There are many ways you can improve medication adherence by implementing these simple ideas:

1) Use a weekly pill organiser so you can easily view which medication was taken when.
2) Set an alarm on your phone every day for the time you take your medication or download a medication reminder app.
3) Create a link to a regular routine in your life each time you take your medication, such as meals or brushing your teeth. This way, you will create an association in your mind to take the medication at that same time.
4) Use blister packs from the pharmacies. Each dose is individually sealed and labelled with the day and time in blister packs, making it easy to take the medicine.
5) Check with your doctor if there is anything they can do to simplify your medications, e.g., switching from taking two different medications to one combination [4].

High-Risk Medications: Where Missing a Dose Can Be Dangerous

For most everyday medications, a single missed dose is unlikely to cause immediate harm. However, for a group of medications referred to as “high-risk” or “critical” medications, missing even one dose can have serious clinical consequences.

• Insulin (rapid-acting and long-acting): Missing a dose of insulin can cause blood glucose to rise rapidly and without correction, this can progress to diabetic ketoacidosis (DKA), particularly in type 1 diabetes.
• Anti-epileptics such as levetiracetam, sodium valproate, and lamotrigine: These medicines must maintain a steady blood concentration to suppress seizure activity. A missed dose can cause levels to drop below the seizure threshold, significantly increasing the risk of a seizure including in patients whose epilepsy has been well controlled.
• Blood thinners such as warfarin and other Direct Oral Anticoagulant: Missing doses of an anticoagulant can allow the blood to return to a clotting-prone state, raising the short-term risk of stroke, deep vein thrombosis, or pulmonary embolism. Taking a double dose to compensate creates the opposite risk, increased bleeding. Either outcome can be serious and requires clinical support.
• Steroids (long-term use) such as prednisolone, and hydrocortisone: Patients on long-term corticosteroids develop a degree of adrenal suppression over time. Suddenly stopping or missing several doses does not allow the adrenal glands to resume normal cortisol production, which can result in adrenal insufficiency or, in severe cases, an adrenal crisis, a medical emergency.
• Heart medications such as beta-blockers such as bisoprolol, and digoxin: Missing doses of beta-blockers can trigger a rebound increase in heart rate and blood pressure as the body temporarily overcompensates. Digoxin has a narrow therapeutic range, meaning both missed doses and double dosing can cause cardiac effects that require medical assessment.
• Psychiatric medications such as antipsychotics, lithium, and certain antidepressant: These medicines often need a stable blood concentration to remain effective. Missing doses can lead to symptom relapse, which may be rapid in conditions such as bipolar disorder or psychosis. Certain antidepressants can also cause discontinuation syndrome, including dizziness, mood changes, and irritability, when doses are missed or the medication is stopped abruptly.

When to Seek Immediate Help

Seek medical advice urgently if:

• You missed multiple doses of a critical medication.
• You have symptoms (e.g., dizziness, seizures, severe pain).
• You are unsure about insulin or blood thinner dosing.

Conclusion

Most of the time, a missed dose will not be dangerous as long as you respond calmly and responsibly. The key thing to keep in mind is that if you miss a dose, take it as soon as you remember, then continue your normal dosing schedule. If it is almost time for the next dose, skip the missed dose and take the next scheduled dose. Never take a double dose to compensate for a missed one. Taking two doses at once can spike the medication level in your body, which may cause serious side effects. Refer to the set of instructions provided in the medication packaging and if you’re unsure about what to do, consult your doctor. Professional medical advice should always be sought when in doubt. They can help pick the best formulation for you, give you combination medications instead of single ones, or adjust your dosing.

HEALTH DISCLAIMER: This content is provided for general informational and educational purposes only. It does not constitute medical advice, diagnosis, or a substitute for professional medical consultation. Every patient’s situation is different. Always seek guidance from your doctor, pharmacist, or qualified healthcare professional for advice specific to your medication and health condition.

References
[1] Albassam, A., & Hughes, D. A. (2021). What should patients do if they miss a dose? A systematic review of patient information leaflets and summaries of product characteristics. European Journal of Clinical Pharmacology, 77(2), 251–260. https://doi.org/10.1007/s00228-020-03003-x
[2] Koracevic, G., Micic, S., Stojanovic, M., Tomasevic, M., Kostic, T., Velickovic Radovanovic, R., Lovic, D., Djordjevic, D., Randjelovic, M., Koracevic, M., & Ristic, Z. (2020). Beta blocker rebound phenomenon is important, but we do not know its definition, incidence or optimal prevention strategies. Hypertension Research, 43(7), 591–596. https://doi.org/10.1038/s41440-020-0449-6
[3] Gilbert, A., Roughead, L., & Sansom, L. I’ve missed a dose; what should I do? Australian Prescriber, 25(1), 16–18. https://doi.org/10.18773/austprescr.2002.010
[4] National Institute for Health and Care Excellence (NICE) (2009). Medicines adherence: involving patients in decisions about prescribed medicines and supporting adherence (CG76). Retrieved from https://www.nice.org.uk/guidance/cg76
[5] NHS Specialist Pharmacy Service. (2023). Advising on missed or delayed doses of medicines. Retrieved April 22, 2026, from https://www.sps.nhs.uk/articles/advising-on-missed-or-delayed-doses-of-medicines/