Found this on the internet, sounds like it can cause a lot of stuff. Stick with and finish it or your infection can come back worse. Hang in there, it will be over soon! Here's what I found:
How should I take Levaquin?
Take Levaquin exactly as directed by your doctor. If you do not understand these instructions, ask your pharmacist, nurse, or doctor to explain them to you.
Take each dose with a full glass of water (8 ounces). Drink several extra glasses of fluid each day to prevent the formation of Levaquin crystals in the urine.
Levaquin may be taken with or without food.
Take Levaquin at evenly spaced intervals.
Do not take antacids that contain magnesium or aluminum (e.g., Tums or Rolaids), the ulcer medicine sucralfate (Carafate), or vitamin or mineral supplements that contain iron or zinc for a minimum of 2 hours before or 2 hours after a dose of Levaquin. Taking antacids, sucralfate, or vitamin or mineral supplements too close to a dose of Levaquin can greatly decrease the effects of the antibiotic.
Take all of the Levaquin that has been prescribed for you even if you begin to feel better. Your symptoms may start to improve before the infection is completely treated.
Store this medication at room temperature away from moisture and heat.
What happens if I miss a dose?
Take the missed dose as soon as you remember. However, if it is almost time for the next dose, skip the missed dose and take only the next regularly scheduled dose. Do not take a double dose of this medication unless otherwise directed by your doctor.
What happens if I overdose?
Seek emergency medical attention.
The most common symptom of a Levaquin overdose is seizures.
What should I avoid while taking Levaquin?
Avoid prolonged exposure to sunlight. Levaquin may increase the sensitivity of the skin to sunlight, and a severe sunburn may result. If sun exposure is unavoidable, wear protective clothing and sunscreen. Call your doctor if you experience severe burning, redness, itching, rash, or swelling after exposure to the sun.
Use caution when driving, operating machinery, or performing other hazardous activities. Levaquin may cause dizziness. If you experience dizziness, avoid these activities.