May 1998: adverse event reports received

672 reports in the openFDA release of 28 Sep 2026

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An API dataset query result cannot be used to estimate the risk associated with the product or compare one drug or device product with another. When looking at the results, be aware that there is no certainty that the reported drug or device caused the adverse event. This dataset should not be the sole source of information for clinical decision-making or other assumptions about the safety or effectiveness of a product. The adverse event may have been related to an underlying disease, other drugs used at the same time or other non-drug related sources. FDA Center for Veterinary Medicine

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672reports received

427same month a year earlier+57%

455monthly average, preceding 12 months

41.5%concern dogscats 11.3%

FDA's database holds 672 adverse event reports received in May 1998, against 427 in the same month a year earlier and a monthly average of 455 over the preceding 12 months.

41.5% of the month's reports concern dogs, 11.3% cats and 15.9% horses; the rest concern other species, exposed people, or give no species.

By active ingredient, the drugs named most often were moxidectin (184), carprofen (175) and lufenuron + milbemycin oxime (24), and the terms listed most often were death (134), accidental exposure (112) and no sign (98). Report volume has a seasonal shape, with more reports in the warmer months when parasite products are in heavier use.

The months around it

Drugs named most often, by active ingredient

Active ingredients recorded for the drug	Reports	Share of the month's reports
Moxidectin	184	27.4%
Carprofen	175	26%
Lufenuron + Milbemycin Oxime	24	3.6%
Selegiline Hydrochloride	22	3.3%
Ketamine Hydrochloride	18	2.7%
Penicillin G Benzathine + Penicillin G Procaine	16	2.4%
Medetomidine	15	2.2%
Butorphanol Tartrate	14	2.1%
Tiletamine Hydrochloride + Zolazepam Hydrochloride	14	2.1%
Melarsomine Dihydrochloride	13	1.9%
Lufenuron	12	1.8%
Milbemycin Oxime	12	1.8%
Atipamezole Hydrochloride	11	1.6%
Tilmicosin Phosphate	10	1.5%
Doramectin	9	1.3%

Ordered by report count, which follows how widely each drug was in use. FDA states that these data cannot be used to estimate risk or to compare one product with another. Brand and manufacturer names are masked by FDA in these records.

Signs listed most often

Death19.9%134
Accidental exposure[exposure that was not intended]16.7%112
No sign[no clinical sign was reported]14.6%98
Vomiting11.5%77
Depression[dull, quiet or withdrawn]10.7%72
Anorexia[not eating]10%67
Vials, Leaking[a product quality report, not a sign in an animal]9.1%61
Ataxia[unsteady, uncoordinated movement]7.6%51
Unclassifiable adverse event[event that fits no dictionary term]7.6%51
Diarrhoea[diarrhea]6.1%41
Convulsion[seizure]5.5%37
Death by euthanasia[the animal was euthanized]5.4%36
Locking Mechanism Abnormal5.4%36
Seal, Abnormal[a product quality report, not a sign in an animal]4.9%33
Recumbency[lying down and unable or unwilling to rise]3.7%25

Single ingredients, pooled

Moxidectin27.4%184

Carprofen26%175

Lufenuron5.4%36

Milbemycin Oxime5.4%36

Selegiline Hydrochloride3.3%22

Penicillin G Procaine3.1%21

Ketamine Hydrochloride2.7%18

Penicillin G Benzathine2.4%16

Medetomidine2.2%15

Butorphanol Tartrate2.1%14

Tiletamine Hydrochloride2.1%14

Zolazepam Hydrochloride2.1%14

Species

Dog41.5%279

Cat11.3%76

Horse15.9%107

Other or not given31.3%210

Questions about May 1998

How many animal drug adverse event reports did FDA receive in May 1998?

672 reports are in the openFDA release of 28 Sep 2026. The same month a year earlier has 427.

Which drugs were named most often?

By active ingredient: moxidectin (184), carprofen (175), lufenuron + milbemycin oxime (24), selegiline hydrochloride (22) and ketamine hydrochloride (18). Brands are masked in the public data.

Which signs were listed most often?

death (134), accidental exposure (112), no sign (98), vomiting (77) and depression (72).

Can the count for a month still change?

Yes. FDA posts reports quarterly with a delay of three to six months, so the newest months are incomplete and usually grow in later releases. Older months change little.

Does a busy month mean something went wrong that month?

Not by itself. The date is when FDA received the report, not when the event happened, and volume follows season, product launches and publicity. FDA states that "there is no certainty that the reported drug or device caused the adverse event" and that the event "may have been related to an underlying disease, other drugs used at the same time or other non-drug related sources."

Where this comes from. Counts are built from the openFDA Animal & Veterinary adverse event bulk files released 28 Sep 2026, which hold reports FDA's Center for Veterinary Medicine received through 31 Mar 2026. openFDA masks brand and manufacturer names in these files, so drugs are counted by the active ingredients each record discloses and no figure is attributed to a brand, application or company. Ingredient names, and the separate reference lists of approved products, follow the FDA Green Book as of 1 Oct 2026. The month is the date FDA first received the report, not the date of the event. No report text, lot numbers or reporter details are published. See the methodology and sources; FDA's record is authoritative, and corrections are handled within five working days.