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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Brand Name
Unisom Sleeptabs
Generic Name
Doxylamine Succinate
Active Ingredient
DoxylamineCategory
Nonsteroidal Anti-inflammatory Drug [EPC]
Salt Form
Succinate
Variants
1
Different strengths and dosage forms
| Strength | Form | Route | NDC |
|---|---|---|---|
| 25 mg/1 | TABLET | ORAL | 41167-0063 |
Detailed information about Unisom Sleeptabs
This page is for informational purposes only and does not replace medical advice. Before using any prescription or over-the-counter medication for Unisom Sleeptabs, you must consult a qualified healthcare professional.
Doxylamine succinate is a first-generation antihistamine of the ethanolamine class. It is primarily used as a short-term sedative to treat insomnia and to relieve symptoms of the common cold and allergic rhinitis.
Specific dosage adjustments are not well-defined in manufacturer labeling, but caution is advised as reduced clearance may increase the risk of anticholinergic toxicity.
Use with caution. Hepatic dysfunction may prolong the half-life of Doxylamine, requiring lower doses or increased dosing intervals.
According to the Beers Criteria, Doxylamine should generally be avoided in the elderly. Older adults are highly sensitive to anticholinergic effects, which can increase the risk of confusion, dizziness, and falls.
If you miss a dose, take it as soon as you remember. However, if it is nearly time for your next dose or if you are taking it for sleep and it is already morning, skip the missed dose. Do not double the dose to catch up.
Signs of overdose include extreme drowsiness, dilated pupils, fever, rapid heart rate (tachycardia), and in severe cases, seizures or hallucinations. If an overdose is suspected, contact a Poison Control Center or seek emergency medical attention immediately.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose without medical guidance.
> Warning: Stop taking Doxylamine and call your doctor immediately if you experience any of these.
Prolonged use of Doxylamine can lead to the development of tolerance, where the sedative effect becomes less effective over time. Long-term use of anticholinergic drugs has also been investigated for potential links to cognitive decline in older adults, though specific data for Doxylamine is still being studied.
No FDA black box warnings are currently issued for Doxylamine. However, it carries significant warnings regarding its use in pediatric populations and the elderly.
Report any unusual symptoms to your healthcare provider.
Doxylamine is a potent CNS depressant. Patients must be aware that its effects can last significantly longer than other OTC sleep aids, potentially impairing performance the following morning.
No FDA black box warnings for Doxylamine.
For short-term OTC use, routine lab monitoring is generally not required. However, if used long-term or in combination with other medications, your provider may monitor:
Do not drive, operate heavy machinery, or engage in hazardous activities until you know how Doxylamine affects you. The impairment can be significant and may persist for several hours after waking.
Avoid alcohol while taking Doxylamine. Alcohol synergistically increases the CNS depressant effects of the drug, leading to extreme sedation, respiratory depression, and increased risk of accidents.
If you have been taking Doxylamine for an extended period, do not stop abruptly without consulting your doctor. While not typically associated with a severe withdrawal syndrome, 'rebound insomnia' (worsened sleep after stopping) can occur.
> Important: Discuss all your medical conditions with your healthcare provider before starting Doxylamine.
For each major interaction, the mechanism typically involves either pharmacodynamic synergism (additive effects on the brain) or anticholinergic summation. Management usually involves avoiding the combination or reducing the dosage under medical supervision.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking.
Patients who have experienced severe reactions to Diphenhydramine (Benadryl) or Clemastine should use Doxylamine with extreme caution, as they are chemically related ethanolamines.
> Important: Your healthcare provider will evaluate your complete medical history before prescribing Doxylamine.
Doxylamine is generally considered one of the safest antihistamines for use during pregnancy. It is FDA-approved (in combination with Pyridoxine) specifically for pregnancy-related nausea. According to the ACOG (American College of Obstetricians and Gynecologists), it is a first-line treatment for morning sickness when lifestyle changes fail.
Doxylamine is excreted in breast milk. Because of the risk of sedation and irritability in the nursing infant, as well as the potential to decrease milk supply, its use is generally discouraged while breastfeeding.
Doxylamine is not recommended as a sleep aid for children under 12. In younger children, it is primarily used for allergy relief, but parents must be cautious of paradoxical excitation, where the child becomes hyperactive instead of sleepy.
Elderly patients are at a significantly increased risk for the adverse effects of Doxylamine. The American Geriatrics Society (AGS) lists it as a potentially inappropriate medication for older adults due to the risk of cognitive impairment, delirium, and urinary retention.
Because the metabolites are cleared renally, patients with a GFR < 30 mL/min should be monitored closely for signs of accumulation and increased side effects.
Patients with significant liver disease (Child-Pugh Class B or C) may require a 50% dose reduction due to impaired metabolism of the drug.
> Important: Special populations require individualized medical assessment.
Doxylamine is a competitive antagonist at the H1 Histamine receptor. By binding to these receptors, it prevents the action of endogenous histamine. Its sedative properties arise from its ability to cross the blood-brain barrier and block H1 receptors in the brain's arousal centers. It also acts as a potent antagonist at Muscarinic (M1-M5) receptors, which accounts for its anticholinergic profile.
| Parameter | Value |
|---|---|
| Bioavailability | ~25% |
| Protein Binding | Low to Moderate |
| Half-life | ~10 hours |
| Tmax | 2-3 hours |
| Metabolism | Hepatic (CYP2D6, 1A2, 2C9) |
| Excretion | Renal (approx. 60%) |
Doxylamine is classified as a First-Generation Antihistamine and a Sedative-Hypnotic. It is related to other ethanolamines like diphenhydramine and carbinoxamine.
Common questions about Unisom Sleeptabs
Doxylamine is primarily used as a short-term sedative-hypnotic to help people who have difficulty falling asleep, a condition known as occasional insomnia. Additionally, it is used as an antihistamine to relieve symptoms of the common cold, hay fever, and other upper respiratory allergies, such as sneezing and runny nose. In clinical settings, it is also frequently prescribed in combination with Vitamin B6 to treat nausea and vomiting during pregnancy. Because it causes significant drowsiness, it is one of the most common active ingredients in over-the-counter nighttime sleep aids. It is not intended for long-term use for sleep issues without a doctor's consultation.
The most common side effect of Doxylamine is significant daytime or next-day drowsiness, often referred to as a 'medication hangover.' Patients also frequently report anticholinergic effects such as dry mouth, dry nose, and a dry throat. Other common reactions include blurred vision, constipation, and a feeling of lightheadedness or dizziness. Some individuals may experience a slightly upset stomach or nausea after taking the medication. Because these effects are common, it is important to avoid tasks requiring alertness until the effects have fully worn off.
No, you should strictly avoid consuming alcohol while taking Doxylamine. Both alcohol and Doxylamine are central nervous system depressants, and when taken together, they can dangerously increase each other's effects. This combination can lead to extreme sedation, severe respiratory depression, and significantly impaired motor coordination. Using them together increases the risk of accidental injury, falls, and potentially fatal overdose. Always ensure that Doxylamine has completely cleared your system before consuming any alcoholic beverages.
Doxylamine is generally considered one of the safest medications for managing nausea and vomiting during pregnancy when used under medical supervision. It has been extensively studied and is a key component of FDA-approved treatments for 'morning sickness.' However, it should only be used during pregnancy if clearly needed and recommended by a healthcare provider. While it does not have a high risk of birth defects, a doctor must evaluate the specific benefits versus risks for each individual patient. Always consult your obstetrician before starting any new medication while pregnant.
Doxylamine typically begins to take effect within 30 minutes of oral administration. Peak concentrations in the bloodstream are usually reached within 2 to 3 hours, which is when the sedative effect is most intense. Because of this timeline, it is recommended to take the medication about 30 minutes before your intended bedtime. The effects can last for a significant duration, often between 8 and 12 hours. Users should ensure they have a full night's sleep available to avoid waking up feeling excessively groggy.
Yes, you can generally stop taking Doxylamine suddenly, as it is not typically associated with physical dependence or severe withdrawal symptoms when used as directed for short periods. However, if you have been using it nightly for sleep, you may experience 'rebound insomnia,' where it becomes even harder to fall asleep for a few nights after stopping. It is best to use Doxylamine only for occasional sleeplessness rather than every night. If you find you cannot sleep without it, you should speak with a healthcare provider to address the underlying cause of your insomnia. Long-term use is generally discouraged because the body can develop a tolerance to its sedative effects.
If you are taking Doxylamine for allergy symptoms and miss a dose, take it as soon as you remember, unless it is almost time for your next scheduled dose. If you are taking it as a sleep aid and miss the dose before bedtime, do not take it if you wake up in the middle of the night or in the morning. Taking it too late can result in severe groginess and impairment the next day. Never take two doses at once to make up for a missed one. Simply resume your normal dosing schedule the following evening if the medication is still needed.
Weight gain is not a commonly reported side effect of short-term Doxylamine use. However, some first-generation antihistamines have been associated with increased appetite or weight changes when used chronically. Doxylamine's primary side effects are related to sedation and its anticholinergic properties rather than metabolic changes. If you notice unusual weight gain while taking this medication, it may be due to other factors or a different medication you are taking. Consult your doctor if you have concerns about weight changes while on this or any other medication.
Doxylamine can interact with many other medications, particularly those that also affect the central nervous system or have anticholinergic properties. It should not be taken with MAO inhibitors, as this can lead to dangerously high blood pressure or severe anticholinergic symptoms. You must also be cautious when combining it with opioid pain relievers, anxiety medications, or other sleep aids, as this increases the risk of excessive sedation. Even over-the-counter products like other antihistamines or cold medicines may contain similar ingredients, leading to an accidental overdose. Always provide your doctor or pharmacist with a full list of your current medications to check for safety.
Yes, Doxylamine succinate is widely available as a generic medication and is often much more affordable than brand-name versions. It is sold under various store brands as a 'nighttime sleep aid' or 'allergy relief' tablet. The generic versions are required by the FDA to have the same active ingredient, strength, and effectiveness as the brand-name products. You can find it in most pharmacies, grocery stores, and online retailers without a prescription. When purchasing, always check the 'Drug Facts' label to ensure that Doxylamine succinate is the only active ingredient if you are seeking a pure sleep aid.
Other drugs with the same active ingredient (Doxylamine)