01Absolute is the word the insert already chose
Urgent care writes cipro. The spasm tablet stays in the evening pocket. That pair is contraindicated. Blood pressure fell in the study. Drowsiness and psychomotor scores worsened.
Fluvoxamine for OCD plus a physio 4 mg is the other classic miss. There is no micro-dose that makes 33-fold polite.
Azithromycin is not this wall. See the Z-Pak docket for QT, not for a 33-fold story.
02The caution list that is not the wall but is not nothing
Zileuton, other quinolones, amiodarone, mexiletine, propafenone, cimetidine, famotidine, oral contraceptives, acyclovir, ticlopidine. If they must be used, the insert talks 2 mg steps.
Fluoxetine is not the 33-fold pair. Still name it if both files sit together.
03A hold script when urgent care already wrote cipro
Hold the pair until both prescribers answer. Do not take tonight's 4 mg because the UTI hurts more. The label studied a single 4 mg with ciprofloxacin: Cmax about 7-fold, AUC about 10-fold. Blood pressure fell. Drowsiness and psychomotor scores worsened.
A three-day cipro course is still days of 10-fold exposure if the 4 mg continues. A pharmacist wink that keeps both is not a hold. Make the hold explicit. Skipping the 4 mg during cipro is the right direction if the infection drug must stay.
Fluvoxamine is the uglier multiplier: Cmax about 12-fold, AUC about 33-fold, half-life about 3-fold after 4 mg. There is no micro-dose, no 1 mg crumb, no 'just for neck tone' exception. Ask for a spasm drug that does not live on CYP1A2.
If both already met and the person feels drunk or cannot stay upright, urgent care. Bring both boxes. Do not take more of either.
A clinic swap from cipro to a Z-Pak so the 4 mg can stay clears this wall and inherits a QT conversation. Read the QT-flag memo. Do not swap the other way because someone said macrolides are weaker. Weaker is the wrong axis.
Other CYP1A2 inhibitors are avoid-or-caution: zileuton, some other quinolones, amiodarone, mexiletine, propafenone, cimetidine, famotidine, oral contraceptives, acyclovir, ticlopidine. If they must be used, the insert talks 2 mg steps, not 4 mg three times a day.
Fluoxetine is not the 33-fold pair. Still name it. Combined oral contraceptives lowered clearance in label PK. Start low if the drug is even appropriate.
Azithromycin is not this wall. Lisinopril is not this wall. Name the INNs. Do not treat antibiotic or blood-pressure as one row.
Mail [email protected] if a caption ever says use caution for cipro plus tizanidine. The insert already chose contraindicated.
04The 4 mg studies in one grid
Healthy subjects, single 4 mg, ten people in each labeled interaction study. These are not forum multipliers. They are insert numbers.
A three-day cipro course is still days of 10-fold exposure if the 4 mg continues.
| Inhibitor | Cmax | AUC | Word |
|---|---|---|---|
| Fluvoxamine | ~12x | ~33x | Contraindicated |
| Ciprofloxacin | ~7x | ~10x | Contraindicated |
| Other 1A2 inhibitors | Less quantified | Avoid / start 2 mg | Not a shrug |
05When a clinic swaps cipro to a Z-Pak so you can keep 4 mg
You escaped the 10-fold wall. You inherited a QT conversation. Read the QT-flag memo.
Do not swap the other way (Z-Pak to cipro) because someone said macrolides are 'weaker.' Weaker is the wrong axis.
- Fluvoxamine - stop pair
- Cipro - stop pair
- 3-day cipro still counts
- Azithromycin ≠ this wall
06Hold the pair. Do not hide the 4 mg because the UTI hurts more.
Call both prescribers. Infection and spasm both need an owner. A pharmacist override 'just three days' is still the wall.
If the 4 mg already met cipro tonight and you cannot stay upright, that is urgent care, not a wait-for-morning.
07Keep the wall in the first sentence of the list
Driving: sedation chip. Long file: docket.
Mail [email protected] if a caption ever says 'use caution' for cipro. Disclaimer.
Hold the pair until both prescribers answer. Do not take tonight's 4 mg because the UTI hurts more. Ten-fold is the cipro study, not a vibe.
A three-day cipro course is still days of 10-fold exposure if the 4 mg continues. A wink that keeps both is not a hold.
Skipping the 4 mg during cipro is the right direction if the infection drug must stay. Make the hold explicit.
Fluvoxamine is the uglier multiplier: about 12-fold Cmax, 33-fold AUC, 3-fold half-life after a single 4 mg. No micro-dose. No neck-tone exception.
If both already met and the person feels drunk or cannot stay upright, urgent care. Bring both boxes. Do not take more of either.
A swap from cipro to a Z-Pak so the 4 mg can stay clears this wall and inherits a QT conversation. Read the QT-flag memo.
Do not swap a Z-Pak to cipro because someone said macrolides are weaker. Weaker is the wrong axis.
Other CYP1A2 inhibitors are avoid-or-caution. If they must be used, the insert talks 2 mg steps, not 4 mg three times a day.
Fluoxetine is not the 33-fold pair. Combined oral contraceptives lowered clearance in label PK. Start low if the drug is even appropriate.
Azithromycin is not this wall. Lisinopril is not this wall. Name the INNs.
Renal impairment raises tizanidine exposure. Below 25 mL/min the insert is cautious. Significant hepatic disease is a hard avoid.
Single doses above 16 mg were not studied. A bedtime pile of the day's 16 is how hypotension and a fall arrive together.
Mail the desk if a caption ever says use caution for cipro plus tizanidine. The insert already chose contraindicated.
Sofia refuses to downgrade absolute to caution. The insert already chose the word.
Ciprofloxacin plus tizanidine is an absolute stop. Ten-fold AUC is the file.
Fluvoxamine plus tizanidine is an absolute stop. Thirty-three-fold is the file.
One leftover Cipro night is still the interaction and still leftover myth.
Sister quinolones are not automatic greens. Ask. Cipro is already red.
Smoking stories do not cancel fluvoxamine.
Oral contraceptives go on the same card as 4 mg.
New antivirals get named. This desk will not invent a grade.
A three-day hold is not a wash this memo will write. Owners clock it.
Cmax jumps matter as much as AUC when you stand up and the pressure drops.
This CYP memo will not quote a dollar. The lock is the enzyme list.
Sofia Mendes will not clear a Cipro pair from the thread.
If both tablets are already in, call today. Do not wait for a worse faint.
Ciprofloxacin plus tizanidine is an absolute contraindication. About ten-fold AUC and about seven-fold Cmax are the file. Leftover Cipro is also leftover-antibiotic myth.
Fluvoxamine plus tizanidine is an absolute contraindication. About thirty-three-fold AUC and about twelve-fold Cmax are the file. Smoking talk does not cancel it.
Sister quinolones are not automatic greens. Ask before any quinolone lands next to 4 mg. This memo stamps Cipro red.
A three-day hold is not a wash this memo will write. Tell both desks the last 4 mg time.
Oral contraceptives and new antivirals go on the same card. Grades are not invented here.
Cmax jumps matter when you stand up and the pressure drops. If both tablets are already in, call today.
This CYP memo will not quote a dollar. The lock is the enzyme list and the 4 mg tablet.
Sofia Mendes will not clear a Cipro pair from the thread.
Prescribed-online still means a licensed clinician where you live. This inbox is not that clinician.
Keep the 4 mg bottle and the forbidden names on one list so the next urgent desk sees both.
One leftover Cipro night is enough to write the interaction and enough to write leftover-antibiotic myth. AUC can rise about ten-fold. Cmax about seven-fold. Call both desks.
Smoking talk does not cancel fluvoxamine. A three-day hold is not a wash this memo will invent. Tell both desks the last 4 mg time.
Oral contraceptives and new antivirals go on the same card. Grades are not invented here. Cmax jumps matter when you stand up.
If both a contraindicated tablet and 4 mg are already in, call today. Do not wait for a worse faint.
This CYP memo will not quote a dollar. Sofia Mendes will not clear a Cipro pair from the thread.
Prescribed-online still means a licensed clinician where you live. Keep the 4 mg bottle and the forbidden names on one list.
Sister quinolones are not automatic greens. This memo stamps ciprofloxacin red. Oral contraceptives and new antivirals still go on the card. Grades are not invented here.
A three-day hold is not a wash this desk will write. Keep the 4 mg bottle and the forbidden names on one list. This CYP memo will not quote a dollar.
Ciprofloxacin and fluvoxamine are absolute next to tizanidine 4 mg. Ten-fold and thirty-three-fold AUC jumps are the file. One leftover Cipro night is enough. Call both desks.
This CYP memo will not invent a three-day wash or a dollar. Keep the forbidden names on the same card as the 4 mg bottle. Prescribed-online still means a licensed clinician where you live.
If both tablets are already in, call today. Do not wait for a worse faint. Absolute means absolute on fluvoxamine and ciprofloxacin.
Sources
- Zanaflex PI 7.1-7.2 / 12.3: fluvoxamine Cmax 12x AUC 33x t½ 3x; cipro Cmax 7x AUC 10x after 4 mg.
- Contraindications section 4: potent CYP1A2 inhibitors (fluvoxamine, ciprofloxacin).
Checked against the current label and reviewed by Dr. Sofia Mendes. See Intake, Markup, Peer-pass, File.