Antiemetic, Serotonin Antagonist
Class Summary
In a recent emergency department study, ondansetron was shown to decrease likelihood of vomiting, increase oral intake, and decrease emergency department length of stay.[13]
Ondansetron (Zofran)
Selective 5-HT3-receptor antagonist that blocks serotonin both peripherally and centrally. Prevents nausea and vomiting associated with emetogenic cancer chemotherapy (eg, high-dose cisplatin), and complete body radiotherapy.
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| Symptom/Sign | Mild Dehydration | Moderate Dehydration | Severe Dehydration |
| level of consciousness | Alert | Lethargic | Obtunded |
| Capillary refill* | 2 s | 2-4 s | >4 s, cool limbs |
| Mucous membranes | Normal | Dry | Parched, cracked |
| Tears | Normal | Decreased | Absent |
| Heart rate | Slightly increased | Increased | Very increased |
| Respiratory rate/pattern* | Normal | Increased | Increased and hyperpnea |
| Blood pressure | Normal | Normal, but orthostasis | Decreased |
| Pulse | Normal | Thready | Faint or impalpable |
| Skin turgor* | Normal | Slow | Tenting |
| Fontanel | Normal | Depressed | Sunken |
| Eyes | Normal | Sunken | Very sunken |
| Urine output | Decreased | Oliguria | Oliguria/anuria |
| * Best indicators of hydration status[6] | |||
| Severity | Infants (weight < 10 kg) | Children (weight >10 kg) |
| Mild dehydration | 5% or 50 mL/kg | 3% or 30 mL/kg |
| Moderate dehydration | 10% or 100 mL/kg | 6% or 60 mL/kg |
| Severe dehydration | 15% or 150 mL/kg | 9% or 90 mL/kg |
| Solution | Carbohydrate (g/dL) | Sodium (mEq/L) | Potassium (mEq/L) | Base (mEq/L) | Osmolality |
| Pedialyte | 2.5 | 45 | 20 | 30 | 250 |
| Infalyte | 3 | 50 | 25 | 30 | 200 |
| Rehydralyte | 2.5 | 75 | 20 | 30 | 310 |
| WHO/UNICEF* | 2 | 90 | 20 | 30 | 310 |
| * World Health Organization/United Nations Children's Fund | |||||
| Solution | Carbohydrate (g/dL) | Sodium (mEq/L) | Potassium (mEq/L) | Base (mEq/L) | Osmolality |
| Apple juice | 12 | 0.4 | 26 | 0 | 700 |
| Ginger ale | 9 | 3.5 | 0.1 | 3.6 | 565 |
| Milk | 4.9 | 22 | 36 | 30 | 260 |
| Chicken broth | 0 | 2 | 3 | 3 | 330 |

