General
Phenergan (promethazine)
Virtual visit

Phenergan (promethazine)

With our quick and easy online prescription process, you can manage your health effortlessly — whether you need a first-time prescription for Phenergan (promethazine) or a refill of an existing one.

Licensed providers in all 50 states

Expert-guided, evidence-based treatments

Skip the trip to the doctor's office

Visit options

Costs shown are for the visit only. You'll pay for medication at your preferred pharmacy.

Video Visit

$25

Est. or $100 w/o insurance

Most insurance accepted

Board-certified

No hidden fees

Available nationwide

What is Phenergan (promethazine)?

Phenergan is a phenothiazine antihistamine used to treat nausea, vomiting, motion sickness, and allergic reactions. It works by blocking histamine and dopamine receptors in the brain, particularly in the area that triggers the vomiting reflex. It also has sedating properties that make it useful for managing anxiety before medical procedures or for promoting sleep in certain situations. Available in tablet, suppository, and injectable form, it's a versatile medication that's been used in clinical practice for decades.

Dual receptor blockade

Blocks both histamine H1 receptors and dopamine receptors in the chemoreceptor trigger zone of the brain—directly suppressing the signals that initiate the nausea and vomiting response.

Motion sickness and allergy relief

Its antihistamine activity makes it effective for motion-related nausea and allergic symptoms like itching, runny nose, and hives by preventing histamine from binding to its receptors.

Sedating properties

Promethazine's CNS effects produce meaningful sedation, making it useful for pre-procedure anxiety relief and as a sleep aid in appropriate clinical settings.

Virtual visit with clinician

Ongoing support, always available.

You’ll be supported by experienced clinicians who care for a wide range of health needs, from everyday concerns to more complex conditions.

Our clinicians track your progress over time and adjust your care as needed. If medication is prescribed, we’ll manage dosing and monitor for side effects. If lab testing is recommended, we review results and refine your plan accordingly. You’re never left to navigate care on your own.

All your care in one place. That’s the General Medicine difference.

We help you understand your options, connect you to the right clinicians, manage prescriptions, coordinate any needed evaluations, and keep an eye on your overall health along the way. It’s comprehensive care that looks at the full picture — your goals, your history, your lifestyle — and makes it simple to move forward with confidence.

Your care plan
Clinician

What our customers have to say

“I feel like I’m finally on the right path to improving my health with the right support now! It’s so refreshing and reassuring.”

Emerald

“My experience with General Medicine was amazing. The understanding and care that was taken to figure out what is exactly going on with me. I feel like a weight has been lifted off of me.”

Kaylee

“I couldn’t be happier with my experience with General Medicine! They are fast, responsive, kind and knowledgeable. It is much easier, more affordable and faster.”

Nika

Get the care you need, without the wait.

Frequently Asked Questions

How quickly does Phenergan work for nausea?

Oral and rectal promethazine typically begins working within 20–30 minutes. The injectable form works even faster. Effects generally last 4–6 hours, making it effective for planned situations like surgery or travel.

Can I take it for motion sickness before traveling?

Yes. Taking Phenergan 30–60 minutes before travel is recommended for motion sickness prevention. It's one of the more effective options available and can be taken the night before for an early departure.

Is Phenergan safe for children?

Phenergan is contraindicated in children under 2 years of age due to the risk of fatal respiratory depression. Use in older children should be carefully supervised — always follow clinician guidance on dosing.

What side effects might I experience?

Significant drowsiness, dry mouth, blurred vision, dizziness, and constipation are common. Promethazine is strongly sedating — avoid driving or operating machinery. Involuntary muscle movements can rarely occur.

Can I drink alcohol while taking Phenergan?

No. Combining promethazine with alcohol significantly amplifies sedation and can be dangerous. Avoid alcohol, sedatives, and other CNS depressants while taking Phenergan.
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