Where a 400 mg Neurontin titration actually gets counted
Enter the 400 mg capsule as a step on a written ladder. Annotate creatinine clearance before you praise a cheap 90-count. Stamp the daily total. Close with a taper date, not a leftover bottle in a drawer.
| Pharmacy | Strength / count | How the window works | Official page |
|---|---|---|---|
| Costco | 400 mg x 90 | Warehouse cash; membership may apply | Costco pharmacy |
| CVS | 400 mg x 90 | Ordinary cash counter | CVS pharmacy |
| Kroger | 400 mg x 90 | Grocery pharmacy cash window | Kroger pharmacy |
| Cost Plus Drugs | 400 mg x 90 | Mail-order cash list | Cost Plus Drugs pharmacy |
Warehouse, chain, grocery, and mail windows still quote generic gabapentin 400 mg x 90 - Costco, CVS, Kroger, and Cost Plus. Public coupon files put a 90-count near a modest retail and a lower coupon print. GoodRx and SingleCare stay in the caption. Each row opens that chain only.
A cheap 90-count is not a titration. Postherpetic neuralgia climbs day by day - 300 mg on day one, 600 on day two, 900 on day three - then the prescriber may add 400 mg capsules to reach a tolerated total, often toward 1800 mg per day in divided doses. Swallowing three 400s on night one because the bottle was on sale is how people fall asleep at the kitchen table.
This Boston review desk marks the quote month and leaves the cart empty. If your window filled 90 capsules, the clinical count is still the daily milligrams versus the kidney, not the vial size.
Neuropathy NNT ink on the studies shelf
Numbers-needed-to-treat from postherpetic trials sit in the neuropathy trial file. This formulary line does not reprint those tables. It records how a 400 mg capsule is counted so the trial dose and the bottle dose can be compared without wishful rounding.
A patient who 'tried gabapentin' at 100 mg at bedtime did not try the labeled PHN climb. Annotate the highest tolerated divided total and the clearance before you stamp failure.
Close the trial talk when the kidney, the taper, and the divided count are on the card. Outcomes ink stays on the studies shelf.
Stopping cold is a seizure and rebound risk
The label says to taper over a minimum of one week unless a serious reaction forces a faster stop. Abrupt withdrawal can unmask seizures even in people who were taking gabapentin for pain, not epilepsy. Rebound insomnia and a jagged pain flare are the milder version. Write the step-down on the same card as the climb.
A 400 mg three-times-daily habit does not become zero on Friday because the 90-count ran out. Call for a bridge or a written taper. Drawer leftovers from an old 300 mg bottle are not a plan.
If rash, swelling, or trouble breathing appears, that is a stop-now exception - then we choose a different agent. The one-week taper is for ordinary closes, not anaphylaxis.
Immediate-release 400 is not an ER swap
Gralise and Horizant carry gabapentin in different salt or release systems with their own food rules and indication lists. A 400 mg Neurontin capsule three times daily is not a unit-for-unit stand-in. If a mail window substitutes an ER product to 'match gabapentin,' send it back to the prescriber for a new line.
Antacids with aluminum or magnesium can trim gabapentin absorption. Separate them by about two hours. That is a smaller clock than ciprofloxacin's cation rule, but it still belongs on the bottle.
Morphine and other opioids can raise gabapentin levels. The stack is pharmacologic, not just additive sleepiness.
Sedation, driving, and the alcohol stack
- New dizziness - hold the next up-titration until it settles
- Opioid or alcohol stack - re-count the daily total
- Edema - check clearance and the capsule count before adding a diuretic by habit
- Mood change or suicidal thoughts - same-day contact, not a weekend wait
Somnolence, dizziness, and ataxia are the everyday marks. They cluster in the first weeks of a climb and after a renal miss. Driving on a new 400 mg midday dose is a judgment call you make after you know how you sit, not on the morning of a highway trip.
Alcohol and other sedatives stack. Opioids plus gabapentin raise breathing-risk talk in safety communications. This desk does not treat that stack as a lifestyle footnote. If both are on the list, the totals get a second look.
Peripheral edema and weight gain show up with time. They are not proof the 400 'is not working.' They are a reason to re-count the daily milligrams and the kidney.
Clearance writes the daily total before pain does
Gabapentin leaves the body unchanged in urine. It is not a liver-metabolized sedative you can ignore in CKD. Half-life is about 5 to 7 hours when creatinine clearance is healthy. In a labeled renal study of single 400 mg doses, mean half-life stretched from about 6.5 hours when clearance was above 60 mL/min to about 52 hours when clearance fell below 30. That is why the daily range collapses as the kidney slows.
Label bands for ages 12 and up: clearance at or above 60 mL/min keeps the familiar 900 to 3600 mg per day in three doses. Clearance 30 to 59 drops to 400 to 1400 mg per day, often twice daily. Clearance 15 to 29 is 200 to 700 mg once daily. At 15 mL/min the range is 100 to 300 mg once daily, then proportional cuts below that. Hemodialysis adds a supplemental 125 to 350 mg after a four-hour session on top of the maintenance math.
A 400 mg three-times-daily stamp in a clearance of 25 mL/min is not a titration. It is an accumulation. Check the number before you celebrate a pain score.
Postherpetic climb versus epilepsy three-times-daily
| Creatinine clearance | Daily range on the label | How the desk splits it |
|---|---|---|
| >= 60 mL/min | 900-3600 mg | Usually three times daily |
| 30-59 mL/min | 400-1400 mg | Often twice daily |
| 15-29 mL/min | 200-700 mg | Once daily |
| 15 mL/min | 100-300 mg | Once daily, then proportional cuts |
| Hemodialysis | Maintenance + 125-350 mg after 4 h | Supplement after the session |
Postherpetic neuralgia on the label starts 300 mg on day one, 300 mg twice on day two, 300 mg three times on day three, then may rise to 1800 mg per day. Some patients need less. Some need the labeled ceiling. The 400 mg capsule appears when the climb leaves the neat 300s. Trial NNT talk lives on the Neurontin 400 mg trial file - this page stays with how the count is written.
Epilepsy in patients 12 and older often starts 300 mg three times daily and may titrate toward 600 mg three times daily. Totals up to 3600 mg per day appear in the renal table for preserved clearance. Missing doses on a seizure line is not the same risk as missing a pain dose - do not borrow a pain patient's casual skip habit.
Off-label restless-leg and anxiety scripts are common in the wild. They still inherit the renal table and the taper. They do not inherit a license to jump to 400 three times a day on day one.
100, 300, and 400 are steps, not brands
White 100, yellow 300, orange 400 - those are the Neurontin capsule colors on the reference label. Tablets at 600 and 800 exist for people already on high divided totals. Liquid at 250 mg per 5 mL covers swallow limits. THL-06 locks the SERP card on 400 because that is the mid-ladder capsule this desk reviews, not because 100 and 300 vanished.
Absorption uses an L-amino-acid transporter that saturates. Doubling a single swallow does not double blood levels in a straight line. Divided doses are the labeled habit for a reason. Three 400s at bedtime is a different exposure than 400 with breakfast, lunch, and dinner.
Generic capsules that meet the 400 mg stamp are interchangeable with Neurontin capsules. They are not interchangeable with Gralise or Horizant. Those extended-release products have their own titration and food rules. A pharmacy swap that 'keeps gabapentin' but changes the release is a different line.
Steroid pain and mood neighbors on this desk
Nerve pain next to a steroid burst is a common pair. Deltasone 20 mg can lift mood and glucose while gabapentin lowers the daytime ceiling. The two lines do not cancel. They stack insomnia if you dose a late 400 with a late prednisone.
Fluoxetine 10 mg is a different column - serotonin, not a calcium-channel-adjacent anticonvulsant. Combining them is common in mixed mood-and-pain charts. Combining them is not a reason to skip the gabapentin renal table.
Stamp each line on its own rules. Close each line on its own taper or hold.
Close the Neurontin count
THL-06 entered a 400 mg capsule as a titration piece, annotated the renal table and the saturable gut step, and stamped a one-week minimum taper when the line is meant to end.
A cheap 90-count is a vial size. The count that matters is daily milligrams versus creatinine clearance, split across the day.
Change a dose or a stop date with the clinician who owns the seizure or pain indication - not from a leftover orange capsule and a guess.
Talk with your own clinician or pharmacist before you change a tablet or a dose. Open the ledger disclaimer.
Updated: