Melissa, just saw this post since I've been off-line most of the week due to my puppy, Mooch's, occasionally hankering for power cords and internet lines, and couldn't replace them til yesterday.
As for your symptoms from the Plaquinil, every one you're experiencing are listed as possible side effects in the online PDR (Physician's Desk Reference for Rx drugs). I've included the copy below:
What are the possible side effects of Plaquenil?
Side effects cannot be anticipated. If any develop or change in intensity, tell your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking this drug.
Side effects of treatment for lupus or and rheumatoid arthritis may include: abdominal cramps, change in eye color, vision problems (e.g., light flashes or streaks), acne, anemia, lightening of hair, blisters in mouth and eyes, blood disorders, convulsions, diarrhea, nausea, vomiting, diminished reflexes or severe muscle problems including paralysis, dizziness, nausea, emotional changes, darkening of skin, lightenin of hair, skin rashes, headache, hearing loss or ringing in ears, breathing difficulties, heart problems, hives, itching, light intolerance, liver problems or failure, hair loss, loss or lack of appetite, nightmares, psoriasis, skin rash or inflammation , dizziness, extreme fatigue, weight loss.
It also mentions that one should avoid alcohol and any other medication that's processed through the liver; that it makes one more sensitive to light and sun; that it should be avoided in anyone with kidney or liver problems; and that it should be taken with a full glass of water or food.
I was also prescribed the initial standard SLE dose of 400 mg a day and had the same symptoms as you're having (and I'd never had mouth ulcers until taking it), plus terrible nausea and a lot of bloodwork problems they at first thought was leukemia. But it was the nausea that caused me to reduce my own dose by half and my muscle problems and fatigue have gotten much better, although it took a couple months to clear my system before I felt any improvement just recently.
I also take methotrexate, but it has many of the same side effects. I've included the pre-cautions and possible side-effects of it anyway below, since so many of us here take it and I've read posts about all of its side effects from our members one time or another:
What should I avoid while taking Methotrexate?
You should avoid getting pregnant or trying to become pregnant, breastfeeding, drinking alcohol, or receiving certain live vaccines.
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What are possible food and drug interactions associated with Methotrexate?
If Methotrexate is taken with certain other drugs, the effects of either could be increased, decreased, or altered. It is especially important to check with your doctor before combining Methotrexate with the following: chloramphenicol, certain antibiotics, nonsteroidal anti-inflammatory drugs (NSAIDs), penicillin-type antibiotics, phenylbutazone, phenytoin, probenecid, salicylates, tetracycline, theophylline, trimethoprim/sulfamethoxazole, and vitamins containing folic acid.
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What are the possible side effects of Methotrexate?
Side effects cannot be anticipated. If any develop or change in intensity, tell your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking this drug.
Side effects may include: cancer of the lymphatic system (lymphoma); kidney damage; lower white cells, red cells, and platelets in your blood; liver damage; lung disease; infections; severe anemia; severe skin reactions and rashes.
Unfortunately, many of the popular infusions used for SLE are methotrexate-based drugs, so they all have similar side effects. On the upside, most negative side-effect tend to lessen after one takes either Plaquinil or methotrexate for a couple of months. But some people's reactions to either drug are so severe that they're either considered allergic to one or the other and stop taking it on the advice of their doctor. Since I also have polymysistis, a muscle-weakening disease, and a spinal condition that also causes inflammation, as well as SLE, I had to cut back on the Plaquinil in order to continue taking it. Thought I'd have to give it entirely until just last week (about 6-8 weeks after I cut back) when I started noticing how much better my muscles felt and how I no longer needed naps several times a day. Then I remembered that my first rheumy told me that it takes a couple of month's for Plaquinil and methotrexate to work on inflammation (& no one's sure how either of them do this exactly in RA or SLE), but if I miss a dose it would be no big deal since it also takes a long time for these drugs to clear our bodies after we stop taking them. So then it made sense to me why it took so long to feel any better after cutting back on it.
Hope this helps some. pax, pj