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324<br />

<strong>HIV</strong>/<strong>AIDS</strong> TREATMENT AND CARE CLINICAL PROTOCOLS FOR THE WHO EUROPEAN REGION<br />

3.2. Interactions of STI/RTI drugs <strong>and</strong> ARVs<br />

If PL<strong>HIV</strong> are on ART, possible drug interactions with o<strong>the</strong>r STI treatment drugs should be considered<br />

<strong>and</strong> discussed with <strong>the</strong>m (see Table 6).<br />

Table 6. interactions between o<strong>the</strong>r sti/rti drugs <strong>and</strong> arvs<br />

STI/RTI agent STI/RTI<br />

agent<br />

dosage<br />

Azithromycin<br />

Ciprofloxacin<br />

Co-trimoxazole<br />

(TMP/SMX)<br />

Erythromycin<br />

base (E-Base,<br />

Ilosone, E-<br />

Mycin, Eryc,<br />

Ery-Tab)<br />

Famciclovir<br />

(Famvir)<br />

600 mg x<br />

1 dose<br />

1200 mg<br />

x 1 dose<br />

750 mg<br />

Q12H x 3<br />

days<br />

750 mg x<br />

1 dose<br />

160/800<br />

mg Q12H<br />

x 1 week<br />

ARV ARV<br />

dosage<br />

EFV 400 mg<br />

x 7 days<br />

IDV 800 mg<br />

TID<br />

ddI 200 mg<br />

(buffered<strong>for</strong>mulation)<br />

Q12H x<br />

3 days<br />

ddI 400 mg<br />

(enteric<br />

coated<br />

capsule)<br />

x 1 dose<br />

IDV 400 mg<br />

Q6H x 1<br />

week<br />

Agent<br />

effect<br />

on ARV<br />

levels<br />

No significant<br />

change<br />

No significant<br />

change<br />

ddI AUC:<br />

↓ 16%;<br />

Cmax: ↓<br />

28%<br />

Not studied<br />

No significant<br />

change<br />

— APV — Not studied;<br />

may<br />

↑ APV<br />

levels<br />

250 mg<br />

QID x 7<br />

days<br />

500 mg x<br />

1 dose<br />

SQV 1200 mg<br />

TID<br />

FTC 200 mg<br />

x 1 dose<br />

SQV<br />

AUC:<br />

↑ 99%;<br />

Cmax: ↑<br />

106%<br />

No significant<br />

change<br />

ARV effect<br />

on agent<br />

levels<br />

Azithromycin<br />

AUC: no<br />

significant<br />

change;<br />

Cmax: ↑<br />

22%<br />

Potential<br />

clinical<br />

effects<br />

Management<br />

— No dose<br />

adjustment<br />

necessary<br />

— — No dose<br />

adjustment<br />

necessary<br />

Ciprofloxacin<br />

AUC: ↓<br />

15-fold (with<br />

simultaneous<br />

ddI dosing);<br />

↓ 26% when<br />

ciprofloxacin<br />

is dosed 2<br />

hours be<strong>for</strong>e<br />

or 6 hours<br />

after ddI<br />

tablets.<br />

No significant<br />

change<br />

TMP AUC:<br />

↑ 19%;<br />

SMX AUC:<br />

no significant<br />

change<br />

Not studied;<br />

may increase<br />

erythromycin<br />

levels<br />

↓ ciprofloxacin<br />

effects<br />

— ↑ SQV<br />

effects<br />

— No<br />

significant<br />

change<br />

Consider<br />

ddI enteric<br />

coated<br />

capsule or<br />

administer<br />

ddI tablets/<br />

suspension<br />

6 hours<br />

prior to or<br />

2 hours<br />

after ciprofloxacinadministration<br />

— No dose<br />

adjustment<br />

necessary<br />

— No dose<br />

adjustment<br />

necessary<br />

— Dose<br />

adjustment<br />

not established<br />

Dose<br />

adjustment<br />

not established<br />

No dose<br />

adjustment<br />

necessary<br />

Suggested<br />

alternative<br />

agent(s)<br />

—<br />

—<br />

—<br />

—<br />

—<br />

Azithromycin,clarithromycin<br />

—<br />

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