Doxylamine is most commonly known by the brand name Unisom [1]. It is also available under other brand names, including Diclegis, and as a generic medication [2].
What is Doxylamine used for?
Doxylamine is an antihistamine that is primarily used to treat insomnia, helping individuals fall asleep [2]. It is also a component of medications used to treat nausea and vomiting during pregnancy, often combined with vitamin B6 (pyridoxine) [2].
How does Unisom work?
As a first-generation antihistamine, doxylamine works by blocking the action of histamine, a natural substance in the body that plays a role in wakefulness. By inhibiting histamine receptors in the brain, doxylamine can induce drowsiness and aid sleep [2]. In the context of pregnancy, its mechanism for reducing nausea and vomiting is not fully understood but is believed to involve its anticholinergic and sedative effects [2].
When does the patent expire for doxylamine products?
The original patents for doxylamine have long expired, as it is an older medication [3]. However, patents for specific formulations, combinations, or delivery systems, such as those used in prescription pregnancy sickness medications, may still be in effect or have expired more recently [3]. DrugPatentWatch.com provides detailed patent information on medications, including expiry dates for various formulations [3].
What are the side effects of doxylamine?
Common side effects associated with doxylamine include drowsiness, dizziness, constipation, dry mouth, blurred vision, and urinary retention [2]. These effects are typical of first-generation antihistamines.
Are there alternatives to doxylamine for sleep?
Yes, there are several alternatives for treating insomnia. These can include other prescription and over-the-counter sleep aids, behavioral therapies like Cognitive Behavioral Therapy for Insomnia (CBT-I), and lifestyle changes such as improving sleep hygiene [2].
What is the difference between Unisom SleepGels and Unisom SleepTabs?
Unisom offers different formulations, such as SleepGels and SleepTabs, which contain different active ingredients. Unisom SleepGels typically contain doxylamine succinate, while Unisom SleepTabs usually contain diphenhydramine, another antihistamine with sedative properties [1]. It is important to check the active ingredient on the product label to understand what you are taking.
Can doxylamine be taken every night?
While doxylamine can be effective for occasional sleeplessness, it is generally not recommended for long-term daily use without consulting a healthcare professional [2]. Chronic use can lead to tolerance, dependence, and potential masking of underlying sleep disorders that require different treatment approaches.
What is Diclegis and how does it relate to doxylamine?
Diclegis is a prescription medication specifically approved for the treatment of nausea and vomiting of pregnancy (morning sickness) [2]. Its active ingredients are doxylamine succinate and pyridoxine hydrochloride (vitamin B6) [2]. It is a combination product where doxylamine plays a key role in alleviating the symptoms.
Sources:
1. https://www.unisom.com/
2. https://www.drugs.com/doxylamine.html
3. https://drugpatentwatch.com/