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DIMENHYDRINATE

Dimenhydrinate, commonly known by brand names such as Dramamine or Gravol, is an antihistamine medication that has been the subject of numerous clinical trials for its effectiveness in treating various conditions. This article explores how dimenhydrinate has been studied in clinical settings, focusing primarily on its use for preventing and treating nausea, vomiting, and vertigo. As an over-the-counter medication that works by affecting the vestibular system and histamine receptors, dimenhydrinate offers potential benefits for patients in diverse medical scenarios, from post-operative recovery to motion sickness and vertigo management.

# Dimenhydrinate: A Comprehensive Guide for Patients Table of Contents – [What is Dimenhydrinate?](#what-is-dimenhydrinate) – [How Dimenhydrinate Works](#how-dimenhydrinate-works) – [Medical Uses](#medical-uses) – [Motion Sickness and Vertigo](#motion-sickness-and-vertigo) – [Nausea and Vomiting](#nausea-and-vomiting) – [Postoperative Nausea and Vomiting (PONV)](#postoperative-nausea-and-vomiting-ponv) – [Administration Methods](#administration-methods) – [Dosage Information](#dosage-information) – [Side Effects](#side-effects) – [Precautions and Warnings](#precautions-and-warnings) – [Effectiveness Compared to Other Medications](#effectiveness-compared-to-other-medications) – [Special Populations](#special-populations) What is Dimenhydrinate? Dimenhydrinate is a medication primarily used to prevent and treat nausea, vomiting, and dizziness associated with motion sickness, vertigo, and other conditions. It is commonly known by the brand name Dramamine in some countries, while in others it may be sold as Gravol [1]. The medication belongs to a class of drugs called antihistamines, specifically H1-receptor antagonists, which work on the central nervous system. How Dimenhydrinate Works Dimenhydrinate functions by inhibiting the body’s histamine receptors and cholinergic receptors in the brain. Specifically, it affects the vestibular system (the part of your inner ear that helps control balance) and the vomiting center in the brain [3]. When you experience motion sickness or vertigo, there is often an overstimulation of the labyrinthine function (structures in your inner ear). Dimenhydrinate has a depressant action on this hyper-stimulated function, which helps reduce the symptoms of dizziness and the associated nausea [3]. Medical Uses # Motion Sickness and Vertigo Dimenhydrinate has been extensively used for treating motion sickness, which is the feeling of nausea and dizziness that can occur during travel by car, boat, or plane [3]. It is also effective for treating various types of vertigo, which is the sensation that you or your surroundings are spinning or moving. In clinical trials, dimenhydrinate was found to be effective in treating nausea due to vertigo. In one study, patients with vertigo who received 50 mg of dimenhydrinate showed significant improvement in their symptoms [3]. Vertigo describes the illusion of involuntary movement, usually rotational, which is caused by sudden tonic neural activity. Management of patients with spontaneous vertigo and related nausea-vomiting symptoms can be challenging, especially in emergency settings. Dimenhydrinate acts by inhibiting vomiting through affecting the histaminic receptor and cholinergic receptor function center of the vestibular nucleus in the central vestibular system [3]. # Nausea and Vomiting Beyond motion sickness, dimenhydrinate is also used to treat general nausea and vomiting from various causes. It is particularly useful in cases where the nausea is related to inner ear disturbances [5]. In a study involving children with gastroenteritis (an infection that causes inflammation of the stomach and intestines), dimenhydrinate was tested for its effectiveness in controlling vomiting. The researchers noted that dimenhydrinate had the potential to be more cost-effective than other anti-nausea medications, with an average cost of $0.90 US per dose [5]. # Postoperative Nausea and Vomiting (PONV) Dimenhydrinate has been shown to be effective in preventing and treating postoperative nausea and vomiting (PONV), which is a common complication after surgery [1][2]. In a clinical trial focusing on women undergoing abdominal hysterectomy, researchers investigated whether dimenhydrinate could lower the proportion of postoperative nausea and vomiting during the first day after surgery. Participants received either dimenhydrinate or a placebo intravenously after they returned to the ward, and their symptoms were monitored over the next 24 hours [1]. Another study examined the effectiveness of dimenhydrinate in preventing intraoperative nausea and vomiting in patients undergoing cesarean delivery. The medication was given before the induction of spinal anesthesia to determine if it would decrease the overall incidence of these side effects [2]. Administration Methods Dimenhydrinate can be administered in several ways, depending on the condition being treated and the patient’s needs: 1. **Oral tablets**: Commonly available as over-the-counter medication for motion sickness prevention [2][4]. 2. **Intravenous (IV) injection**: Used in hospital settings, particularly for severe nausea or postoperative situations [1][2][3]. 3. **Intravenous infusion**: Sometimes given as a slow infusion over 15-30 minutes, diluted in normal saline [3]. In some studies, dimenhydrinate was administered as follows: – 50 mg intravenously for treating vertigo and associated nausea [3] – 25 mg intravenously before anesthesia induction for prevention of PONV [2] – 50 mg orally before surgery for prevention of PONV [6] – In children with gastroenteritis, multiple doses every six hours (1 mg/kg/dose, maximum dose 50 mg/dose) [5] Dosage Information The dosage of dimenhydrinate varies depending on the condition being treated, the age of the patient, and the route of administration: For adults: – For vertigo and motion sickness: Typically 50 mg by mouth or intravenously [3] – For PONV prevention: 50 mg intravenously or orally before or during surgery [1][6] – For treatment of established PONV: 50 mg intravenously [1] For children: – For gastroenteritis-related vomiting: 1 mg/kg/dose (maximum 50 mg) every six hours [5] The medication can be administered multiple times per day, usually every 4-6 hours as needed, but specific dosing schedules should be determined by healthcare providers. Side Effects While dimenhydrinate is generally considered safe when used as directed, it can cause several side effects: Common side effects include: – **Drowsiness and sedation**: This is the most frequently reported side effect [2] – **Dizziness**: Ironically, although it treats dizziness from vertigo, it can cause dizziness as a side effect – **Dry mouth**: Due to its anticholinergic properties [2] Less common side effects may include: – **Restlessness or insomnia**: Particularly in children [5] – **Tachycardia** (rapid heart rate) [2] – **Blurred vision** Serious but rare side effects that require immediate medical attention: – **Severe allergic reactions**: Such as rash, itching, swelling – **Confusion or agitation** – **Difficulty urinating** In clinical studies, researchers monitored patients for specific side effects including tachycardia, dizziness, restlessness, dry mouth, and oxygen desaturation [2]. Precautions and Warnings Before taking dimenhydrinate, consider the following precautions: – **Pregnancy and breastfeeding**: While dimenhydrinate has been used during pregnancy (particularly for morning sickness), pregnant women should consult their healthcare provider before use [2] – **Elderly patients**: May be more sensitive to side effects, particularly confusion and sedation – **Glaucoma**: The anticholinergic effects may worsen narrow-angle glaucoma – **Enlarged prostate**: May cause urinary retention in men with prostatic hyperplasia – **Heart conditions**: Use with caution if you have heart rhythm problems – **Liver or kidney disease**: May affect how the medication is processed and eliminated Effectiveness Compared to Other Medications Several studies have compared dimenhydrinate to other medications for treating similar conditions: 1. **Versus Metoclopramide for Vertigo-Related Nausea**: One study compared 50 mg of dimenhydrinate to 10 mg of metoclopramide for treating nausea due to vertigo in emergency settings. Both medications were given intravenously as a slow infusion over 15 minutes [3]. 2. **Versus Meclizine for Peripheral Vertigo**: Another trial compared dimenhydrinate (Dramin®) soft gel capsules to meclizine chlorhydrate (Meclin®) for treating symptoms of acute vertigo from peripheral origin. The study assessed various symptoms including distasia, instability when walking, spinning sensation, and tendency to fall [4]. 3. **Versus Piracetam for Peripheral Vertigo**: A double-blind randomized clinical trial compared the efficacy of intravenous piracetam (2 g) and dimenhydrinate (100 mg) in patients with peripheral vertigo [7]. 4. **Versus Ondansetron for PONV**: A study compared the effectiveness of preoperative oral dimenhydrinate (50 mg) versus intraoperative intravenous ondansetron (4 mg) in preventing postoperative nausea and vomiting in patients undergoing laparoscopic cholecystectomy [6]. In some multimodal approaches to preventing PONV, dimenhydrinate (25 mg) is used as part of a combination therapy along with other medications such as aprepitant, perphenazine, ondansetron, and dexamethasone [8]. Special Populations # Pregnant Women Dimenhydrinate has been used in pregnant women, particularly for morning sickness and during cesarean deliveries. In one study, researchers investigated whether an intravenous dose of dimenhydrinate (Gravol) given before the induction of spinal anesthesia would decrease the incidence of intraoperative nausea and vomiting in patients undergoing cesarean delivery [2]. The study noted that dimenhydrinate “has been safely and widely used during pregnancy, labour and Cesarean deliveries,” suggesting its relative safety in this population. However, as with any medication used during pregnancy, it should be taken under medical supervision [2]. # Children Dimenhydrinate has been studied in children, particularly for treating vomiting due to gastroenteritis. In one trial, children from 1 to 12 years of age who had experienced at least 5 episodes of vomiting in the previous 12 hours and were diagnosed with acute gastroenteritis received either dimenhydrinate or placebo every six hours (1 mg/kg/dose, maximum dose 50 mg/dose) [5]. The researchers noted that restlessness and insomnia have been described as potential side effects in children, so careful monitoring is advised [5]. # Elderly Patients Elderly patients may be more sensitive to the side effects of dimenhydrinate, particularly its sedative and anticholinergic effects. This could include increased drowsiness, confusion, dry mouth, constipation, or urinary retention. Therefore, lower doses may be appropriate for elderly individuals, and they should be monitored more closely when taking this medication.
Clinical Trial Focus Dimenhydrinate Dosage Administration Method Comparison Groups Key Outcomes Measured
Postoperative Nausea and Vomiting after Abdominal Hysterectomy 50 mg Intravenous Dimenhydrinate vs. Placebo Occurrence and times of nausea vomiting at ward, 6, 12, 24 hr postoperation
Intraoperative Nausea and Vomiting during Cesarean Delivery 25 mg Intravenous (diluted in 9.5mL normal saline) Dimenhydrinate vs. Placebo Incidence of pre or post-delivery nausea, severity of nausea, presence of retching or vomiting
Nausea Due to Vertigo 50 mg Intravenous infusion (in 150 ml normal saline over 15 minutes) Dimenhydrinate vs. Metoclopramide Changes in nausea and vertigo scores as measured by Visual Analogue Scale
Peripheral Vertigo Treatment 50 mg Oral (3 times per day for up to 30 days) Dimenhydrinate vs. Meclizine Vertigo Score (VS), Quality of Life measurements, sleepiness levels
Gastroenteritis in Children 1 mg/kg/dose (max 50mg/dose) Oral (every 6 hours for 4 doses) Dimenhydrinate vs. Placebo Number of vomiting episodes 24 hours after first dose, need for IV fluids
Enhanced Recovery After Surgery 25 mg Oral (preoperatively) Part of multimodal antiemetic regimen Postoperative nausea and vomiting incidence, hospital-free days
Laparoscopic Cholecystectomy PONV 50 mg Oral (2 hours preoperatively) Dimenhydrinate vs. Ondansetron PONV occurrence at 30 min, 60 min, 12 hours, and 24 hours postoperatively
Peripheral Vertigo Treatment 100 mg Intravenous Dimenhydrinate vs. Piracetam Change in numeric rating scale for vertigo symptoms

FAQ

  • What is dimenhydrinate and how does it work? Dimenhydrinate is an antihistamine medication commonly used to prevent and treat nausea, vomiting, and dizziness. It works by blocking histamine receptors in the vestibular system (inner ear) and affecting the brain's vomiting center. This helps reduce stimulation that can cause symptoms like dizziness and nausea. It's available in various forms including tablets, injections, and liquid formulations, and is sold under brand names like Dramamine and Gravol.
  • What conditions is dimenhydrinate being studied for in clinical trials? Clinical trials have studied dimenhydrinate for several conditions including: postoperative nausea and vomiting (PONV) following surgeries like abdominal hysterectomy and cesarean delivery; vertigo and vertigo-related nausea; nausea due to gastroenteritis in children; and as part of enhanced recovery protocols for various surgical procedures. Some trials also compare dimenhydrinate to other medications like ondansetron, metoclopramide, and meclizine to determine which is more effective for specific conditions.
  • How effective is dimenhydrinate for preventing post-operative nausea and vomiting? Multiple clinical trials have investigated dimenhydrinate's effectiveness for post-operative nausea and vomiting (PONV). In these studies, dimenhydrinate is typically administered intravenously (through an IV) at doses ranging from 25-50mg. The research examines whether giving dimenhydrinate before, during, or after surgery can reduce the occurrence of nausea and vomiting in the hours following surgery. Some trials compare it to placebo, while others compare it to other anti-nausea medications. Results vary across studies, which is why ongoing research continues to determine the optimal timing, dosage, and patient populations that benefit most.
  • What are the common dosages of dimenhydrinate used in clinical trials? In clinical trials, dimenhydrinate dosages vary depending on the condition being treated and the administration method. Common dosages include: 50mg intravenously for post-operative nausea and vomiting; 25mg intravenously for nausea during cesarean delivery; 1mg/kg orally for children with gastroenteritis (typically given every 6 hours); and 50mg orally three times daily for vertigo treatment. Some trials studying enhanced recovery protocols after surgery use 25mg oral doses preoperatively. The medication is sometimes given as a single dose, while in other studies it's administered multiple times over a treatment period.
  • What side effects of dimenhydrinate have been observed in clinical trials? In clinical trials, dimenhydrinate has been associated with several side effects, though they're typically mild to moderate. Common side effects include drowsiness and sedation, which can be measured using sedation scales. Other reported side effects include dizziness, dry mouth, and in some cases, restlessness. When comparing side effects to other anti-nausea medications, researchers often monitor for specific reactions like tachycardia (rapid heart rate) and desaturation (decreased oxygen levels). Most trials include monitoring of these potential side effects as secondary outcomes alongside the medication's effectiveness for its primary purpose.

Ongoing Clinical Trials on DIMENHYDRINATE

  • Study on the Safety and Effectiveness of Ocrelizumab vs. Fingolimod for Children and Adolescents with Relapsing-Remitting Multiple Sclerosis

    Not recruiting

    1 1 1
    Investigated diseases:
    Investigated drugs:
    Austria Belgium Bulgaria Croatia Denmark Estonia +11

Glossary

  • Antiemetic: A medication used to prevent or treat nausea and vomiting. Dimenhydrinate is classified as an antiemetic.
  • Postoperative Nausea and Vomiting (PONV): Nausea and/or vomiting that occurs after a surgical procedure, typically within the first 24-48 hours. It's a common complication that can affect patient comfort, recovery time, and hospital stay duration.
  • Vertigo: A sensation of spinning or movement when a person is actually stationary. It's caused by problems with the inner ear or brain and is different from dizziness, which is a feeling of lightheadedness.
  • Vestibular System: The sensory system in the inner ear that provides the brain with information about motion, equilibrium, and spatial orientation. Dimenhydrinate works partly by affecting this system.
  • Histamine Receptor: Proteins on cell surfaces that bind with histamine, a compound involved in local immune responses and regulating physiological function. Dimenhydrinate blocks certain histamine receptors to produce its effects.
  • Placebo: A substance with no active therapeutic effect, used in clinical trials as a control to determine the effectiveness of a medicinal drug.
  • Randomized Controlled Trial (RCT): A study design where participants are randomly assigned to receive either the treatment being tested or a control (often a placebo), allowing researchers to evaluate the intervention's effectiveness.
  • Visual Analog Scale (VAS): A measurement tool used to assess subjective characteristics or attitudes that cannot be directly measured, such as the intensity of nausea or pain. Typically presented as a line with descriptors at each end.
  • Intravenous (IV): Administered directly into a vein. Many clinical trials of dimenhydrinate use IV administration for quick effect.
  • Gastroenteritis: Inflammation of the stomach and intestines, typically resulting from bacterial or viral infection, causing vomiting and diarrhea.
  • Prophylactic: A treatment given or action taken to prevent disease. In clinical trials, dimenhydrinate is often given prophylactically to prevent nausea and vomiting.
  • Ondansetron: Another antiemetic medication that works by blocking serotonin receptors. It's often compared to dimenhydrinate in clinical trials for effectiveness in treating nausea and vomiting.
  • Metoclopramide: A medication that speeds up the movement of the stomach muscles, helping to treat nausea and vomiting. It's compared to dimenhydrinate in some clinical trials.
  • Abdominal Hysterectomy: Surgical removal of the uterus through an incision in the abdomen. Patients undergoing this procedure are often included in clinical trials for postoperative nausea and vomiting prevention.
  • Spinal Anesthesia: A form of regional anesthesia involving the injection of a local anesthetic into the cerebrospinal fluid. Nausea and vomiting are common side effects that dimenhydrinate may help prevent.
  • Enhanced Recovery Protocol (ERP): A set of standardized medical practices designed to improve patient outcomes and speed recovery after surgery. Some protocols include dimenhydrinate as part of the strategy to reduce post-operative nausea and vomiting.

References

  1. https://clinicaltrials.gov/study/NCT06395064
  2. https://clinicaltrials.gov/study/NCT00791960
  3. https://clinicaltrials.gov/study/NCT02253524
  4. https://clinicaltrials.gov/study/NCT02112578
  5. https://clinicaltrials.gov/study/NCT00124787
  6. https://clinicaltrials.gov/study/NCT05590936
  7. https://clinicaltrials.gov/study/NCT01890538
  8. https://clinicaltrials.gov/study/NCT04606264