Type of Infection¹

Dosage

Frequency

(hours)

Route

Urinary tract infections

500 mg or 1 g

8 or 12

IM or IV

Gonorrhoea / cystitis

1 g

single dose

IM

Cystic fibrosis

2 g

6 - 8

IV

Moderately severe systemic infections

1 g or 2 g

8 or 12

IM or IV

Severe systemic or life-threatening infections

2 g

6 or 8

IM or IV

Other infections either

or

1 g

2 g

8

12

IM or IV

IV

¹ Because of the serious nature of infections due to Pseudomonas aeruginosa, a dose of 2 g every 6 or 8 hours is recommended, at least for initial therapy in systemic infections caused by this organism.