Cyclic Vomiting Syndrome Medication
- Author: Thangam Venkatesan, MBBS; Chief Editor: Carmen Cuffari, MD more...
Antiemetic Agents
Class Summary
The CNS vomiting center (VC) may be stimulated directly by GI irritation, motion sickness, or vestibular neuritis. Increased activity of central neurotransmitters, such as dopamine in the chemoreceptor trigger zone (CTZ) or acetylcholine in the VC, appear to be major mediators of vomiting. An emetogenic episode may initiate the release of serotonin (5-HT) from enterochromaffin cells in the GI tract. 5-HT then binds to 5-HT3 receptors that stimulate vagal neurons that transmit signals to the VC, resulting in nausea and vomiting. Pharmacologic agents are directed to the particular etiology or mechanism that stimulates the vomiting response.
Cyproheptadine (Periactin)
Nonselective antihistamine effective in CVS and for migraines.
Also an appetite stimulant. Therapeutic effects are observed within 1-2 wk. Excellent choice for children < 5 y.
Amitriptyline (Elavil)
TCAs such as amitriptyline are excellent first-line choices in children >5 y. Has anticholinergic and sedating side effects; thus, best administered at bedtime. Cardiac arrhythmia, especially in overdose, has been described; monitoring the QTc interval both before starting and after reaching the target level is advised. Up to 1 mo may be needed to see clinical effects.
Propranolol (Inderal)
Beta-adrenergic blocker and excellent first-line agent for prophylaxis when used at low doses. Has a 57% efficacy rate, with efficacy defined as 50% reduction in frequency and severity of episodes. Requires 1 wk for efficacy and requires gradual withdrawal over 1 wk. Dose may be monitored by fall in presleep resting pulse from baseline. Decline < 15-20 bpm indicates dose may be further increased.
Phenobarbital (Luminal)
May be used in patients with or without EEG changes. A 79% response rate has been observed in patients with CVS.
Erythromycin (E.E.S., Eryc, E-Mycin, Erythrocin)
Gastric prokinetic that stimulates coordinated gastric emptying. A 75% response rate has been demonstrated in patients with CVS.
Ondansetron (Zofran)
This 5-HT3 antagonist directly acts at the CTZ and vagal afferents from the GI tract. Attenuates or occasionally aborts an active episode of CVS. High dose more effective in patients with CVS.
Sumatriptan (Imitrex)
This 5-HT1B/1D agonist may effectively terminate an episode of CVS by constricting cerebral vasculature. High dose more effective in patients with CVS.
Lorazepam (Ativan)
Because of both their sedative and antinausea properties, sedatives may be helpful. Induce sedation and anxiolysis through central GABA inhibition. Appears synergistic with the antinausea and antiemetic effects of 5-HT3 antagonists. Concomitant sedation and induction of sleep provide sustained relief from intractable nausea.
Diphenhydramine (Benadryl)
For treatment and prophylaxis of vestibular disorders that may cause nausea and vomiting. Provides mild sedation and synergistic antinausea and antiemetic action with 5-HT3 antagonists.
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| Characteristic | Adults (n = 104) | Children (n = 147) |
| Number of ED visits per patient with cyclic vomiting syndrome (Median) | 15 (range, 1-200) | 10 (range, 1-175) |
| Number of ED visits prior to a diagnosis of cyclic vomiting syndrome (Median) | 7 (Range, 1-150) | 5 (Range, 0-65) |
| Diagnosis not made in the ED | 89 (93%) | 119 (93%) |
| Diagnosis not recognized in the ED in patients with an established diagnosis of cyclic vomiting syndrome | 84 (88%) | 97 (80%) |
| Number of different ED visited (Mean ± standard deviation) | 4.69 ± 4.72 | 2.6 ± 2.42 |
| Feature | Children | Adults |
| Age of Onset | 4.8 y (Earliest, 6 d) | 35 y (Latest, 73 y) |
| Delay in Diagnosis | 2.6 y | 8 y |
| Female-to-Male Ratio | 57:43 | 17:24 |
| Frequency | Every 2-4 wk | Every 3 mo |
| Duration (Mean) | 1-2 d (range, 1-10 d) | 6 d (range, 1-21 d) |
| Periodicity | 49% | Not reported |
| Early Morning Onset | 42% | 50% |
| Stereotypical Episodes | 99% | 85% |
| Prodrome | 72%, 1.5 h | 93% |
| Symptoms | Nausea, anorexia, pallor | Nausea, epigastric pain |
| Recovery to Oral Feeding | 6 h | 24 h |
| Relieving Factors | Deep sleep | Hot bath/shower (56%) |
| Precipitating Factors | Stress (47%), infection (31%) | Menses (57%), anxiety |
| Comorbid conditions | Anxiety | Not reported |
| Interepisodic nausea | < 6% | 63% |
| Coalescence of Episodes | Few | 50% |
| Vomiting | 6/hr at peak, bile (81%) | 8.5/hr |
| Systemic Symptoms | Pallor, salivation, listlessness | Intense thirst (33%) |
| GI Symptoms | Anorexia, nausea, diarrhea, abdominal pain | Abdominal pain, diarrhea |
| Neurologic Symptoms | Headache, photophobia, phonophobia, abdominal pain | Irritable, confused |
| Natural history | ≥ 28% progress to migraine | Not reported |
| Family history | 82% | 57% |
| Complications | Dehydration, esophagitis | Dehydration, esophagitis, laparotomy (18%) |
| Morbidity | 14-25 d of missed school/year | 32% completely disabled |

