Pyridoxine Hydrochloride + Doxylamine Succinate
Indications
This combination is indicated for the treatment of nausea and vomiting of pregnancy in women who do not respond to conservative management.
Pharmacology
Doxylamine Succinate is an antihistamine that blocks Histamine (H1) receptor. It can cross the blood brain barrier and has a high affinity for H1 receptors in the brain that blocks H1 receptors. It also decreases the action of histamine at the H1 receptor by inhibiting both vestibular system & Muscarinic receptor. It affects the vestibular system & decreases the stimulation of the vomiting center. Its muscarinic receptor inhibition may also play a role in antihistamine antiemetic activity. Pyridoxine Hydrochloride is a vitamin B6 analog. It is used to prevent nausea and vomiting due to its antiemetic properties.
Dosage & Administration
Initially, take one tablet orally at bedtime (Day 1). If this dose adequately controls symptoms the next day, continue taking one tablet daily at bedtime only. However, if symptoms persist on Day 2, increase the daily dose to one tablet in the morning and one tablet at bedtime. The maximum recommended dose is two tablets per day, one in the morning and one at bedtime. Take on an empty stomach with a glass of water. Swallow tablets whole. Do not crush, chew, or split this tablets. Take daily and not on an as needed basis.
Interaction
Use of Doxylamine Succinate & Pyridoxine Hydrochloride is contraindicated in women who are taking monoamine oxidase inhibitors (MAOIs), which prolong and intensify the adverse central nervous system effects (the anticholinergic effects) of antihistamines. Concurrent use of alcohol and other CNS depressants (such as hypnotic sedatives and tranquilizers) with Doxylamine Succinate & Pyridoxine Hydrochloride is not recommended.
Contraindications
Doxylamine Succinate & Pyridoxine Hydrochloride is contraindicated in women with any of the following conditions:
- Known hypersensitivity to Doxylamine Succinate, other ethanolamine derivative antihistamines, Pyridoxine Hydrochloride or any inactive ingredient in the formulation
- Monoamine oxidase (MAO) inhibitors intensify and prolong the adverse central nervous system effects of Doxylamine Succinate & Pyridoxine Hydrochloride
Side Effects
Somnolence or other accidents resulting from the effect of the combined use of Doxylamine Succinate & Pyridoxine Hydrochloride with CNS depressants.
Pregnancy & Lactation
Pregnancy category A. This is intended for the treatment of nausea and vomiting of pregnancy in women who do not respond to conservative management. Both Doxylamine Succinate & Pyridoxine Hydrochloride are excreted into breast milk. Therefore, caution should be exercised while breastfeeding.
Precautions & Warnings
Doxylamine Succinate & Pyridoxine Hydrochloride may cause somnolence due to the anticholinergic properties of Doxylamine Succinate, an antihistamine. Women should avoid engaging in activities, such as driving or operating heavy machinery, while using Doxylamine Succinate & Pyridoxine Hydrochloride. Doxylamine Succinate & Pyridoxine Hydrochloride use is not recommended if a woman is concurrently using central nervous system (CNS) depressants including alcohol.
Doxylamine Succinate & Pyridoxine Hydrochloride has anticholinergic properties and, therefore, should be used with caution in women with asthma, increased intraocular pressure, narrow angle glaucoma, stenosing peptic ulcer, pyloroduodenal obstruction or urinary bladder-neck obstruction.
Doxylamine Succinate & Pyridoxine Hydrochloride has anticholinergic properties and, therefore, should be used with caution in women with asthma, increased intraocular pressure, narrow angle glaucoma, stenosing peptic ulcer, pyloroduodenal obstruction or urinary bladder-neck obstruction.
Overdose Effects
Doxylamine Succinate & Pyridoxine Hydrochloride is an extended-release or Delayed Release formulation; therefore, signs and symptoms of intoxication may not be apparent immediately. Signs and symptoms of overdose may include restlessness, dryness of mouth, dilated pupils, sleepiness, vertigo, mental confusion and tachycardia. At toxic doses, Doxylamine Succinate exhibits anticholinergic effects, including seizures, rhabdomyolysis, acute renal failure and death. If treatment is needed, it consists of gastric lavage or activated charcoal, whole bowel irrigation and symptomatic treatment.
Therapeutic Class
Anti-emetic drugs
Storage Conditions
Store at below 30°C in a dry place protected from light. Keep out of reach of children.
