Situation Summary

• Patient woke with nausea at 6:15 AM (classic PEP side effect)
• Brushed teeth, washed mouth, food particles came out while cleaning tongue (~6:40 AM)
• You are asking: give Ondem 4mg now? Take Deltra (dolutegravir) at 9:30 AM?

Answers

1. Ondem (Ondansetron) 4mg - YES, you can give it now

2. Deltra (Dolutegravir) at 9:30 AM - YES, but with food

• Wait until the Ondem has taken effect (30-45 min)
• At 9:30 AM, have the patient eat a small, light meal first (a few biscuits, toast, banana - something bland)
• Then take the Deltra tab right after eating

Quick Practical Plan

When to Be Concerned

• If vomiting is persistent (3+ episodes) or the patient cannot keep any food/fluid down, contact the prescribing doctor - the regimen may need to be reviewed or changed
• If Deltra is vomited within 1 hour of taking it, inform the doctor as the dose may need to be repeated
• Nausea from PEP is very common in the first 1-2 weeks and usually improves on its own

What Is Happening

Advice & Management

A. Immediate - Right Now

• Give Ondem 4mg - controls the nausea reflex
• Ask him to sit upright, do not lie down
• Sip cold water slowly - cold water reduces the smell sensation and settles the stomach
• Avoid hot beverages - they worsen burping

B. For the 9:30 AM Dose (and every daily dose going forward)

C. Add These OTC Measures (safe with PEP)

• Domperidone 10mg (before meals, 3 times a day) - improves gastric motility, reduces burping and nausea. Better choice than metoclopramide for long-term use over 28 days. Safe with dolutegravir.
• Ondem 4mg - as needed for breakthrough nausea, up to 8mg/day
• Antacid (like Gelusil or Digene) - after meals, helps with the gas and bloating. Important: Give antacid at least 2 hours apart from the dolutegravir dose - calcium/magnesium antacids can reduce dolutegravir absorption if taken together.

D. Lifestyle Tips to Tell Him

1. Eat 4-5 small meals instead of 2-3 big ones - large meals worsen gastroparesis and burping
2. Avoid carbonated drinks completely - they massively worsen burping
3. Chew food slowly - swallowing air while eating fast causes more burps
4. After eating, walk gently for 10-15 minutes - helps gastric emptying
5. The symptoms are worst in weeks 1-2 and improve significantly after that - reassure him

Important Safety Note

• Do NOT use ibuprofen or naproxen for any pain/headache during the PEP course - use paracetamol (acetaminophen) only
• If vomiting is so severe he cannot keep the tablet down on any day, call the prescribing doctor - the regimen or timing may need adjustment
• Adherence is everything - missing doses makes PEP fail. Managing these side effects directly protects him from HIV

Summary Prescription Card

Breaking It Down

• Yesterday 9:30 AM - took Deltra tab
• Yesterday night - had dinner
• This morning 6:15 AM - nausea
• 6:40 AM - brushing tongue, last night's dinner food came out

What This Pattern Suggests

1. Gastroparesis / Severely Delayed Gastric Emptying

• Dolutegravir + tenofovir does slow gastric motility as a cumulative effect over days of use
• Each dose adds to this effect - so even though yesterday's tab was taken at 9:30 AM, the cumulative GI slowing from days of PEP use is now significant enough to cause near-complete gastric stasis overnight
• This is not about "yesterday's tablet" causing today's nausea in isolation - it is the ongoing accumulated GI effect of the full PEP regimen

2. The Sequence Makes Sense Now

This Changes Your Management Slightly

Immediate Priority

• Do NOT give anything to eat right now - stomach is already full
• Give Ondem 4mg for nausea
• Domperidone 10mg NOW - this is a prokinetic, it will help push the retained food through. This is more important than the antiemetic right now.
• Small sips of warm water only - no food until nausea settles

For 9:30 AM Deltra Dose Today

• Check: has nausea settled? Is he able to tolerate fluids?
• If yes - give a very light snack only (2-3 biscuits, half a banana) before the tablet
• Do not give a full meal - stomach is still recovering from last night's retention
• Give Deltra at 9:30 as usual - do not skip or delay

Going Forward (Every Evening)

• No heavy dinner during the PEP course
• Last meal should be light and early - by 7:30-8 PM at the latest
• Avoid foods that slow digestion - fatty, fried, meat-heavy dinners
• Domperidone 10mg before every meal going forward to keep motility going
• Sleep with head slightly elevated (extra pillow) - reduces reflux from retained stomach contents

Red Flag - Escalate to Doctor If:

• This happens again tomorrow (food retention on 2 consecutive nights)
• He vomits actual food (not just nausea)
• He cannot take the Deltra tab due to ongoing vomiting
• Significant abdominal bloating or pain

Pantoprazole + Dolutegravir

⚠️ USE WITH CAUTION - Timing is critical

• Give pantoprazole in the morning before breakfast (~7:30-8 AM) - well before the 9:30 AM Deltra dose
• This is the standard dosing of pantoprazole anyway (before breakfast), so it naturally works out

Dose: Pantoprazole 40mg once daily, morning, before breakfast - safe ✓

Domperidone + Dolutegravir

✅ NO INTERACTION EXPECTED

"Coadministration has not been studied but based on metabolism and clearance a clinically significant interaction is unlikely. Domperidone is mainly metabolized by CYP3A4, however, dolutegravir is not expected to inhibit or induce CYP450 enzymes at clinically relevant concentrations."

Summary Table

Practical Prescription for This Patient

Pantoprazole + Domperidone Combination Brands (India)

How to Take (for this patient)

• 1 capsule of Pan-D (or any above brand) - once daily
• 30 minutes before breakfast - on empty stomach
• This automatically keeps it well before the 9:30 AM Deltra dose ✓
• The SR (sustained release) domperidone works throughout the day for motility

One Caution

Why Banana is a Good Choice Here

• Bland, easy to digest - will not worsen nausea
• Soft texture - no gastric irritation
• Naturally settles the stomach (contains antacid-like properties)
• Gives enough food coating in the stomach to reduce dolutegravir-related GI irritation
• Will not interfere with dolutegravir absorption

Current Time is ~9:30-10 AM

• Dolutegravir has a ~14 hour half-life - consistent daily timing matters, but a small delay of 30-60 min is not a problem
• Taking it with food is actually better than fasting for this patient given his GI symptoms

Tell Him Exactly This:

"Eat one banana slowly. Once you finish it, drink half a glass of water, then take your Deltra tab. Sit upright after taking it, don't lie down."

Also Remind

• If nausea comes back after taking the tablet - that is expected and normal, it will pass in 30-45 minutes
• Ondem 4mg can be given if nausea becomes uncomfortable after the dose
• Get Pan-D from the medical store and start it from tomorrow morning before breakfast

What Matters is - Do NOT Lie Down

• Sit on a chair ✓
• Stand ✓
• Walk slowly ✓ (actually best - gentle movement speeds gastric emptying)

How Long?

Practical Advice to Tell Him

"After taking your tablet, don't go back to bed for at least 30-45 minutes. You can sit, watch TV, or take a short slow walk - even 10 minutes of gentle walking helps the food digest faster and reduces the burping."