#benadryl-dosage-calculator {
max-width: 600px;
margin: 20px auto;
padding: 15px;
background: #fff;
border-radius: 5px;
box-shadow: 0 1px 3px rgba(0,0,0,0.1);
font-family: -apple-system, BlinkMacSystemFont, ‘Arial’, sans-serif;
color: #333;
box-sizing: border-box;
}
h2 {
text-align: center;
margin: 0 0 15px;
font-size: 1.4rem;
line-height: 1.2;
color: #333;
}
p {
text-align: center;
color: #666;
font-size: 14px;
margin-bottom: 15px;
}
.form-group {
margin-bottom: 15px;
position: relative;
}
label {
display: block;
margin-bottom: 5px;
font-size: 0.9rem;
font-weight: 600;
}
input[type=”number”], select {
width: 100%;
padding: 8px;
border: 1px solid #ddd;
border-radius: 3px;
font-size: 0.9rem;
box-sizing: border-box;
}
input:focus, select:focus {
border-color: #0073aa;
outline: none;
}
.tooltip {
position: relative;
display: inline-block;
margin-left: 5px;
}
.tooltip .tooltip-text {
visibility: hidden;
width: 180px;
background: #333;
color: #fff;
text-align: center;
border-radius: 3px;
padding: 5px;
position: absolute;
z-index: 10;
bottom: 125%;
left: 50%;
transform: translateX(-50%);
opacity: 0;
transition: opacity 0.3s;
font-size: 0.75rem;
}
.tooltip:hover .tooltip-text {
visibility: visible;
opacity: 1;
}
.button-group {
display: flex;
gap: 10px;
justify-content: center;
margin-top: 15px;
}
button {
padding: 8px 16px;
border: none;
border-radius: 3px;
cursor: pointer;
font-size: 0.9rem;
background: #0073aa;
color: #fff;
}
button:hover {
background: #005177;
}
#reset-btn {
background: #6c757d;
}
#reset-btn:hover {
background: #5a6268;
}
#copy-btn {
background: #28a745;
}
#copy-btn:hover {
background: #218838;
}
#result {
margin-top: 15px;
padding: 10px;
border-radius: 3px;
font-size: 0.9rem;
line-height: 1.4;
min-height: 20px;
}
#result.success {
background: #e6f4ea;
border: 1px solid #28a745;
}
#result.error {
background: #f8d7da;
border: 1px solid #dc3545;
}
.dosage-chart {
margin-top: 10px;
font-size: 0.85rem;
}
.dosage-chart table {
width: 100%;
border-collapse: collapse;
}
.dosage-chart th, .dosage-chart td {
border: 1px solid #ddd;
padding: 5px;
text-align: center;
}
noscript {
display: block;
color: #dc3545;
text-align: center;
margin-top: 10px;
font-size: 0.9rem;
}
@media (max-width: 600px) {
#benadryl-dosage-calculator {
margin: 10px;
padding: 10px;
}
h2 {
font-size: 1.2rem;
}
.button-group {
flex-direction: column;
}
button {
width: 100%;
}
}
`;
resultDiv.innerHTML = `
Recommended Dosage: ${dosageText}
Frequency: Every 8–12 hours, up to 3 times daily.
Weight Used: ${weightInLb.toFixed(1)} lb (${(weightInLb / 2.20462).toFixed(1)} kg)
Dosage Chart: ${chart}
Warnings:
Benadryl Dosage Calculator for Dogs
Calculate a safe dose of Benadryl (diphenhydramine) for your dog. Always consult a vet first.
Pounds (lb)
Kilograms (kg)
Tablet (25 mg)
Liquid (12.5 mg/5 mL)
Enter the dog’s weight, then click “Calculate”.
JavaScript is disabled. Please enable it to use the calculator.
(function() {
if (!document.getElementById(‘benadryl-dosage-calculator’)) return;
const form = document.getElementById(‘calc-form’);
const weightInput = document.getElementById(‘dog-weight’);
const unitSelect = document.getElementById(‘weight-unit’);
const dosageRateInput = document.getElementById(‘dosage-rate’);
const formulationSelect = document.getElementById(‘formulation’);
const resultDiv = document.getElementById(‘result’);
function calculate() {
resultDiv.className = ”;
resultDiv.innerHTML = ”;
try {
const weight = parseFloat(weightInput.value);
const unit = unitSelect.value;
const dosageRate = parseFloat(dosageRateInput.value);
const formulation = formulationSelect.value;
if (!weight || weight <= 0) {
throw new Error('Please enter a valid weight.');
}
if (isNaN(dosageRate) || dosageRate 2) {
throw new Error(‘Dosage rate must be between 1 and 2 mg per lb.’);
}
let weightInLb = unit === ‘kg’ ? weight * 2.20462 : weight;
if (weightInLb < 1) {
throw new Error('Weight is too low; consult a vet for dosing.');
}
const dosageMg = weightInLb * dosageRate;
let dosageText = '';
if (formulation === 'tablet') {
const tablets = Math.round(dosageMg / 25 * 2) / 2; // Nearest half tablet
dosageText = `${dosageMg.toFixed(1)} mg (${tablets} x 25 mg tablet${tablets !== 1 ? 's' : ''})`;
} else {
const ml = (dosageMg / 12.5) * 5;
dosageText = `${dosageMg.toFixed(1)} mg (${ml.toFixed(1)} mL of 12.5 mg/5 mL liquid)`;
}
const chart = `
| Weight (lb) | Dosage (mg) | Tablets (25 mg) | Liquid (mL) |
|---|---|---|---|
| ${(weightInLb * 0.8).toFixed(1)} | ${(weightInLb * 0.8 * dosageRate).toFixed(1)} | ${((weightInLb * 0.8 * dosageRate) / 25).toFixed(1)} | ${(((weightInLb * 0.8 * dosageRate) / 12.5) * 5).toFixed(1)} |
| ${weightInLb.toFixed(1)} | ${(weightInLb * dosageRate).toFixed(1)} | ${((weightInLb * dosageRate) / 25).toFixed(1)} | ${(((weightInLb * dosageRate) / 12.5) * 5).toFixed(1)} |
| ${(weightInLb * 1.2).toFixed(1)} | ${(weightInLb * 1.2 * dosageRate).toFixed(1)} | ${((weightInLb * 1.2 * dosageRate) / 25).toFixed(1)} | ${(((weightInLb * 1.2 * dosageRate) / 12.5) * 5).toFixed(1)} |
Frequency: Every 8–12 hours, up to 3 times daily.
Weight Used: ${weightInLb.toFixed(1)} lb (${(weightInLb / 2.20462).toFixed(1)} kg)
Dosage Chart: ${chart}
Warnings:
- Confirm with your vet before giving Benadryl.
- Use only plain diphenhydramine (no xylitol, alcohol, or other drugs).
- Avoid in dogs with glaucoma, heart disease, or pregnancy.
- Monitor for side effects: drowsiness, dry mouth, or agitation.